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types.js/README.md
Alex A. Naanou 332225e7d3 added several methods + docs... 
Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
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# types.js
A library of JavaScript type extensions, types and type utilities.
- [types.js](#typesjs)
- [Installation](#installation)
- [Basic usage](#basic-usage)
- [`Object`](#object)
- [`Object.deepKeys(..)`](#objectdeepkeys)
- [`Object.copy(..)` (EXPERIMENTAL)](#objectcopy-experimental)
- [`Object.flatCopy(..)`](#objectflatcopy)
- [`Object.match(..)`](#objectmatch)
- [`Object.matchPartial(..)`](#objectmatchpartial)
- [`<object>.run(..)`](#objectrun)
- [`Object.sort(..)`](#objectsort)
- [`Array`](#array)
- [`<array>.first(..)` / `<array>.last(..)`](#arrayfirst--arraylast)
- [`<array>.rol(..)`](#arrayrol)
- [`<array>.compact()`](#arraycompact)
- [`<array>.len`](#arraylen)
- [`<array>.unique()` / `<array>.tailUnique()`](#arrayunique--arraytailunique)
- [`<array>.trim()` / `<array>.trimStart()` / `<array>.trimEnd()`](#arraytrim--arraytrimstart--arraytrimend)
- [`<array>.cmp(..)`](#arraycmp)
- [`<array>.setCmp(..)`](#arraysetcmp)
- [`<array>.sortAs(..)`](#arraysortas)
- [`<array>.inplaceSortAs(..)`](#arrayinplacesortas)
- [`<array>.toKeys(..)`](#arraytokeys)
- [`<array>.toMap(..)`](#arraytomap)
- [`Array.zip(..)` / `<array>.zip(..)`](#arrayzip--arrayzip)
- [`Array.iter(..)` / `<array>.iter()`](#arrayiter--arrayiter)
- [Abortable `Array` iteration](#abortable-array-iteration)
- [`array.STOP` / `array.STOP(..)`](#arraystop--arraystop)
- [`<array>.smap(..)` / `<array>.sfilter(..)` / `<array>.sreduce(..)` / `<array>.sforEach(..)`](#arraysmap--arraysfilter--arraysreduce--arraysforeach)
- [Large `Array` iteration (chunked)](#large-array-iteration-chunked)
- [`array.STOP` / `array.STOP(..)`](#arraystop--arraystop-1)
- [`<array>.CHUNK_SIZE`](#arraychunk_size)
- [`<array>.mapChunks(..)` / `<array>.filterChunks(..)` / `<array>.reduceChunks(..)`](#arraymapchunks--arrayfilterchunks--arrayreducechunks)
- [`Map`](#map)
- [`<map>.sort(..)`](#mapsort)
- [`Set`](#set)
- [`<set>.unite(..)`](#setunite)
- [`<set>.intersect(..)`](#setintersect)
- [`<set>.subtract(..)`](#setsubtract)
- [`<set>.sort(..)`](#setsort)
- [`Date`](#date)
- [`Date.timeStamp(..)`](#datetimestamp)
- [`Date.fromTimeStamp(..)`](#datefromtimestamp)
- [`Date.str2ms(..)`](#datestr2ms)
- [`<date>.toShortDate(..)`](#datetoshortdate)
- [`<date>.getTimeStamp(..)`](#dategettimestamp)
- [`<date>.setTimeStamp(..)`](#datesettimestamp)
- [`String`](#string)
- [`<string>.capitalize()`](#stringcapitalize)
- [`RegExp`](#regexp)
- [`RegExp.quoteRegExp(..)`](#regexpquoteregexp)
- [`Promise`](#promise)
- [Cooperative promises](#cooperative-promises)
- [`Promise.cooperative(..)`](#promisecooperative)
- [`<promise-coop>.set(..)`](#promise-coopset)
- [`<promise-coop>.isSet`](#promise-coopisset)
- [Promise iteration](#promise-iteration)
- [`Promise.iter(..)` / `promise.IterablePromise(..)`](#promiseiter--promiseiterablepromise)
- [`<promise-iter>.map(..)` / `<promise-iter>.filter(..)` / `<promise-iter>.reduce(..)`](#promise-itermap--promise-iterfilter--promise-iterreduce)
- [`<promise-iter>.flat(..)`](#promise-iterflat)
- [`<promise-iter>.then(..)` / `<promise-iter>.catch(..)` / `<promise-iter>.finally(..)`](#promise-iterthen--promise-itercatch--promise-iterfinally)
- [Advanced handler](#advanced-handler)
- [Generator extensions and utilities](#generator-extensions-and-utilities)
- [The basics](#the-basics)
- [`Generator`](#generator)
- [`generator.iter(..)`](#generatoriter)
- [Generator instance iteration](#generator-instance-iteration)
- [`<generator>.map(..)` / `<generator>.filter(..)` / `<generator>.reduce(..)` / `<generator>.flat()`](#generatormap--generatorfilter--generatorreduce--generatorflat)
- [`<generator>.promise()`](#generatorpromise)
- [`<generator>.then(..)` / `<generator>.catch(..)` / `<generator>.finally(..)`](#generatorthen--generatorcatch--generatorfinally)
- [`<generator>.toArray()`](#generatortoarray)
- [Generator constructor iteration](#generator-constructor-iteration)
- [`Generator.at(..)`](#generatorat)
- [`Generator.shift()` / `Generator.pop()`](#generatorshift--generatorpop)
- [`Generator.slice(..)`](#generatorslice)
- [`Generator.map(..)` / `Generator.filter(..)` / `Generator.reduce(..)` / `Generator.flat()`](#generatormap--generatorfilter--generatorreduce--generatorflat-1)
- [`Generator.toArray()`](#generatortoarray-1)
- [`Generator.then(..)` / `Generator.catch(..)` / `Generator.finally(..)`](#generatorthen--generatorcatch--generatorfinally-1)
- [Containers](#containers)
- [`containers.UniqueKeyMap()` (`Map`)](#containersuniquekeymap-map)
- [`<unique-key-map>.set(..)`](#unique-key-mapset)
- [`<unique-key-map>.reset(..)`](#unique-key-mapreset)
- [`<unique-key-map>.rename(..)`](#unique-key-maprename)
- [`<unique-key-map>.orderedRename(..)`](#unique-key-maporderedrename)
- [`<unique-key-map>.unorderedRename(..)`](#unique-key-mapunorderedrename)
- [`<unique-key-map>.keysOf(..)`](#unique-key-mapkeysof)
- [`<unique-key-map>.originalKey(..)`](#unique-key-maporiginalkey)
- [`<unique-key-map>.uniqueKey(..)`](#unique-key-mapuniquekey)
- [`<unique-key-map>.__key_pattern__`](#unique-key-map__key_pattern__)
- [`<unique-key-map>.__unordered_rename__`](#unique-key-map__unordered_rename__)
- [Event](#event)
- [`event.Eventfull(..)`](#eventeventfull)
- [`event.Event(..)`](#eventevent)
- [`event.TRIGGER`](#eventtrigger)
- [`event.EventHandlerMixin`](#eventeventhandlermixin)
- [`<obj>.on(..)`](#objon)
- [`<obj>.one(..)`](#objone)
- [`<obj>.off(..)`](#objoff)
- [`<obj>.trigger(..)`](#objtrigger)
- [`event.EventDocMixin`](#eventeventdocmixin)
- [`<obj>.eventfull`](#objeventfull)
- [`<obj>.events`](#objevents)
- [`event.EventMixin`](#eventeventmixin)
- [Runner](#runner)
- [Micro task queue](#micro-task-queue)
- [`Queue(..)` / `Queue.runTasks(..)`](#queue--queueruntasks)
- [`Queue.handle(..)`](#queuehandle)
- [`<queue>.state`](#queuestate)
- [`<queue>.start(..)`](#queuestart)
- [`<queue>.stop(..)`](#queuestop)
- [`<queue>.then(..)`](#queuethen)
- [`<queue>.runTask(..)`](#queueruntask)
- [`<queue>.tasksAdded(..)` (event)](#queuetasksadded-event)
- [`<queue>.taskStarting(..)` (event)](#queuetaskstarting-event)
- [`<queue>.taskFailed(..)` (event)](#queuetaskfailed-event)
- [`<queue>.taskCompleted(..)` (event)](#queuetaskcompleted-event)
- [`<queue>.queueEmpty(..)` (event)](#queuequeueempty-event)
- [Large task management](#large-task-management)
- [`runner.TaskManager(..)`](#runnertaskmanager)
- [`<task-manager>.Task(..)`](#task-managertask)
- [`<task-manager>.sync_start`](#task-managersync_start)
- [`<task-manager>.record_times`](#task-managerrecord_times)
- [`<task-manager>.titled(..)`](#task-managertitled)
- [`<task-manager>.send(..)`](#task-managersend)
- [`<task-manager>.stop(..)`](#task-managerstop)
- [`<task-manager>.done(..)` (event)](#task-managerdone-event)
- [`<task-manager>.error(..)` (event)](#task-managererror-event)
- [`<task-manager>.tasksDone(..)` (event)](#task-managertasksdone-event)
- [`runner.TaskTicket(..)`](#runnertaskticket)
- [`runner.TaskMixin(..)`](#runnertaskmixin)
- [License](#license)
## Installation
```shell
$ npm install -s 'ig-types'
```
## Basic usage
To extend everything:
```javascript
require('ig-types')
```
To have access to additional library types and utilities:
```javascript
var types = require('ig-types')
```
`types.js` is organized so as to be able to import/extend only specific
sub-modules mostly independently so...
In case there is a need to only extend a specific constructor just import
the module dealing with that constructor (`Array` in this case):
```javascript
// require `ig-types/<constructor-name>`...
require('ig-types/Array')
```
Note that type patching modules are mostly independent.
And to import specific library modules only:
```javascript
var containers = require('ig-types/containers')
```
## `Object`
```javascript
require('ig-types/Object')
```
### `Object.deepKeys(..)`
```bnf
Object.deepKeys(<obj>)
-> <keys>
```
Get list of keys from all objects in the prototype chain.
This is different from `Object.keys(..)` which only gets _own_ keys from the
current object.
Example:
```javascript
var a = { x: 123 }
var b = Object.create(a)
b.y = 321
// get own keys of b...
Object.keys(b) // -> ['y']
// get all keys accessible from b...
Object.deepKeys(b) // -> ['x', 'y']
```
### `Object.copy(..)` (EXPERIMENTAL)
```bnf
Object.copy(<obj>)
-> <obj-copy>
```
Create a copy of `<obj>`
This will:
- create a blank `<obj-copy>`
- link `<obj-copy>` to the same prototype chain
- copy all _own_ keys from `<obj>` to `<obj-copy>`
Note that this will make no attempt to clone object type.
_XXX not yet sure how useful this is._
### `Object.flatCopy(..)`
```bnf
Object.flatCopy(<obj>)
-> <new-obj>
```
Copy all attributes from the prototype chain of `<obj>` into `<new-obj>`.
### `Object.match(..)`
### `Object.matchPartial(..)`
### `<object>.run(..)`
```bnf
<object>.run(<func>)
-> <object>
-> <other>
```
Run a function in the context of `<object>` returning either `<object>`
itself (if returning `undefined`) or the result.
Note that this is accessible from all JavaScript non-primitive objects,
i.e. everything that inherits from `Object`.
Example:
```javascript
var L = [1, 2, 3]
.map(function(e){
return e * 2 })
// see if the first element is 1 and prepend 1 if it is not...
.run(function(){
if(this[0] != 1){
this.unshift(1) } })
console.log(L) // -> [1, 2, 6, 8]
```
`.run(..)` is also available standalone via:
```shell
$ npm install -s object-run
```
For more info see:
https://github.com/flynx/object-run.js
### `Object.sort(..)`
Sort `<obj>` attributes (same as `Array`'s `.sort(..)`)
```bnf
Object.sort(<obj>)
-> <obj>
```
Sort `<obj>` attributes via `<cmp>` function.
```
Object.sort(<obj>, <cmp>)
-> <obj>
```
Sort `<obj>` attributes to the same order of `<order-list>`.
```bnf
Object.sort(<obj>, <order-list>)
-> <obj>
```
Note that this rewrites all the keys of `<obj>` thus for very large
sets of keys/attributes this may be quite expensive.
Note that some keys of `Object` may misbehave in JavaScript, currently keys
that are string values of numbers are sorted automatically by _number value_
and are not affected by `.sort(..)`, this affects both _Chrome_ and _Firefox_.
Example:
```javascript
var o = {x: 0, a: 1, '100':2, '0':3, ' 27 ':4, b:5}
// notice that the order is already different to the order of attributes above...
Object.keys(o)
// -> ['0', '100', 'x', 'a', ' 27 ', 'b']
// '0' and '100' are not affected by .sort(..) while ' 27 ' is...
Object.keys(Object.sort(o, ['x', 'a', '100']))
// -> [ '0', '100', 'x', 'a', ' 27 ', 'b' ]
```
## `Array`
```javascript
require('ig-types/Array')
```
or
```javascript
var array = require('ig-types/Array')
```
### `<array>.first(..)` / `<array>.last(..)`
Get the first/last items of `<array>`.
```bnf
<array>.first()
-> <item>
<array>.last()
-> <item>
```
Set the first/last items of `<array>`.
```bnf
<array>.first(<item>)
-> <array>
<array>.last(<item>)
-> <array>
```
Note that these do not affect `<array>` length unless setting items on
an empty `<array>`.
### `<array>.rol(..)`
Roll `<array>` in-place left.
```bnf
<array>.rol()
<array>.rol(1)
-> <array>
<array>.rol(n)
-> <array>
```
To roll right pass a negative `n` to `.rol(..)`.
### `<array>.compact()`
```bnf
<array>.compact()
-> <compact-array>
```
Generate a compact `<array>` from a sparse `<array>`, i.e. removing all
the empty slots.
### `<array>.len`
Number of non-empty slots/elements in `<array>`.
This is similar to:
```javascript
var L = [,,, 1,, 2, 3,,]
// this is the same as L.len...
L.compact().length
```
Note that this is different from `.length` in that writing to `.len` has
no effect.
### `<array>.unique()` / `<array>.tailUnique()`
Generate an array with all duplicate elements removed.
```bnf
<array>.unique()
-> <array>
```
### `<array>.trim()` / `<array>.trimStart()` / `<array>.trimEnd()`
Copy array removing empty slots from array start, end or both.
```bnf
<array>.trim()
-> <array>
<array>.trimStart()
-> <array>
<array>.trimEnd()
-> <array>
```
### `<array>.cmp(..)`
Compare two arrays.
```bnf
<array>.cmp(<other>)
-> <bool>
```
This will return `true` if:
- `<array>` === `<other>` or,
- lengths are the same and,
- values on the same positions are equal.
### `<array>.setCmp(..)`
Compare to arrays ignoring element order and count.
```bnf
<array>.setCmp(<other>)
-> <bool>
```
### `<array>.sortAs(..)`
Sort array as a different array.
```bnf
<array>.sortAs(<other>)
-> <array>
```
Elements not present in `<other>` retain their relative order and are
placed after the sorted elements.
Example:
```javascript
var L = [1, 2, 3, 4, 5, 6]
var O = [5, 3, 1, 0]
L.sortAs(O) // -> [5, 3, 1, 2, 4, 6]
```
### `<array>.inplaceSortAs(..)`
Sort array as a different array keeping positions of unsorted elements.
```bnf
<array>.inplaceSortAs(<other>)
-> <array>
```
Example:
```javascript
var L = [1, 2, 3, 4, 5, 6]
var O = [5, 3, 1, 0]
L.inplaceSortAs(O) // -> [5, 2, 3, 4, 1, 6]
```
### `<array>.toKeys(..)`
Create an object with array values as keys and index as value.
```bnf
<array>.toKeys()
-> <object>
```
Normalize resulting `<object>` keys:
```bnf
<array>.toKeys(<normalize>)
-> <object>
<normalize>(<elem>, <index>)
-> <key>
```
If `<array>` contains the same value multiple times it will be written
to `<object>` only once with the last occurrences' index.
Since `object` keys can only be `string`s array items that are not
strings will be converted to strings. If this is not desired use `.toMap(..)`
instead.
### `<array>.toMap(..)`
Create a map with array values as keys and index as value.
```bnf
<array>.toMap()
-> <map>
```
Normalize resulting `<map>` keys:
```bnf
<array>.toMap(<normalize>)
-> <map>
<normalize>(<elem>, <index>)
-> <key>
```
Note that if `<array>` contains the same value multiple times it will be used
as key only once and retain the last occurrences' index.
### `Array.zip(..)` / `<array>.zip(..)`
_Zip_ input array items.
```bnf
Array.zip(<array>, <array>, ..)
-> <array>
<array>.zip(<array>, <array>, ..)
-> <array>
```
Example:
```javascript
var A = [1, 2, 3]
var B = ['a', 'b', 'c', 'd']
Array.zip(A, B) // -> [[1, 'a'], [2, 'b'], [3, 'c'], [, 'd']]
```
Array _sparseness_ is retained -- if one of the arrays has an empty slot, or is
not long enough, the corresponding spot in the result will be empty.
Resulting array length is strictly equal to the longest input array length.
### `Array.iter(..)` / `<array>.iter()`
Return an iterator/generator from the current array.
This is mostly useful in combination with the [Generator extensions and utilities](#generator-extensions-and-utilities)
### Abortable `Array` iteration
A an alternative to `Array`'s `.map(..)` / `.filter(..)` / .. methods with ability to
stop the iteration process by `throw`ing `STOP` or `STOP(<value>)`.
```javascript
var {STOP} = require('ig-types/Array')
```
This can be used in two ways:
1) `throw` as-is to simply stop...
```javascript
;[1,2,3,4,5]
.smap(function(e){
// simply abort here and now...
throw STOP })
```
Since we aborted the iteration without passing any arguments to `STOP`,
`.smap(..)` will return `undefined`.
2) `throw` an instance and return the argument...
```javascript
// this will print "4" -- the value passed to STOP...
console.log([1,2,3,4,5]
.smap(function(e){
if(e > 3){
// NOTE: new is optional here...
// ...StopIteratiom is an object.js constructor.
throw new STOP(e) } }))
```
Note that no partial result is returned unless passed through `STOP(..)`.
#### `array.STOP` / `array.STOP(..)`
An _object/constructor_ that if raised (as an exception) while iterating via
a supporting iterator method will abort further execution and correctly exit.
#### `<array>.smap(..)` / `<array>.sfilter(..)` / `<array>.sreduce(..)` / `<array>.sforEach(..)`
Like `Array`'s `.map(..)`, `.filter(..)`, `.reduce(..)` and `.forEach(..)` but
with added support for aborting iteration by throwing `STOP` or `STOP(<value>)`.
### Large `Array` iteration (chunked)
Iterating over very large `Array` instances in JavaScript can block execution,
to avoid this `types.js` implements `.map(..)`/`.filter(..)`/`.reduce(..)`
equivalent methods that iterate the array in chunks and do it asynchronously
giving the runtime a chance to run in between.
In the simplest cases these are almost a drop-in replacements for the equivalent
methods but return a promise.
```javascript
var a = [1,2,3,4,5]
.map(function(e){
return e*2 })
var b
;[1,2,3,4,5]
.mapChunks(function(e){
return e*2 })
.then(function(res){
b = res })
// or with await...
var c = await [1,2,3,4,5]
.mapChunks(function(e){
return e*2 })
```
These support setting the chunk size (default: `50`) as the first argument:
```javascript
var c = await [1,2,3,4,5]
.mapChunks(2, function(e){
return e*2 })
```
#### `array.STOP` / `array.STOP(..)`
Like for [`<array>.smap(..)` and friends](#abortable-array-iteration) iteration
can be stopped by throwing a `array.STOP` / `array.STOP(<value>)` and as before
there are two ways to go:
1) `throw` as-is to simply stop
```javascript
;[1,2,3,4,5]
.mapChunks(function(e){
// simply abort here and now...
throw STOP })
.catch(function(){
console.log('done.') })
```
2) `Throw` an instance and pass a value to `.catch(..)`
```javascript
;[1,2,3,4,5]
.mapChunks(function(e){
if(e > 3){
// NOTE: new is optional here...
// ...StopIteratiom is an object.js constructor.
throw new STOP(e) } })
.catch(function(e){
console.log('first value greater than 3:', e) })
```
#### `<array>.CHUNK_SIZE`
The default iteration chunk size.
Note that the smaller this is the more _responsive_ the code is, especially
in UI applications but there is a small overhead added per chunk.
Default value: `50`
#### `<array>.mapChunks(..)` / `<array>.filterChunks(..)` / `<array>.reduceChunks(..)`
The `.map(..)`, `.filter(..)` and `.reduce(..)` alternatives respectively:
```bnf
<array>.mapChunks(<func>)
<array>.mapChunks(<chunk-size>, <func>)
-> <promise>
<func>(<item>, <index>, <array>)
-> <new-item>
```
```bnf
<array>.filterChunks(<func>)
<array>.filterChunks(<chunk-size>, <func>)
-> <promise>
<func>(<item>, <index>, <array>)
-> <bool>
```
```bnf
<array>.reduceChunks(<func>, <state>)
<array>.mreduceChunks(<chunk-size>, <func>, <state>)
-> <promise>
<func>(<state>, <item>, <index>, <array>)
-> <state>
```
All three support chunk handlers in the same way (illustrated on `.mapChunks(..)`):
```bnf
<array>.mapChunks([<func>, <chunk-handler>])
<array>.mapChunks(<chunk-size>, [<func>, <chunk-handler>])
-> <promise>
<func>(<item>, <index>, <array>)
-> <new-item>
<chunk-handler>(<chunk>, <result>, <offset>)
```
The `<chunk-handler>` gets the completed chunk of data after it is computed
but before the timeout.
## `Map`
```javascript
require('ig-types/Map')
```
### `<map>.sort(..)`
## `Set`
```javascript
require('ig-types/Set')
```
### `<set>.unite(..)`
### `<set>.intersect(..)`
### `<set>.subtract(..)`
### `<set>.sort(..)`
## `Date`
```javascript
require('ig-types/Date')
```
### `Date.timeStamp(..)`
### `Date.fromTimeStamp(..)`
### `Date.str2ms(..)`
### `<date>.toShortDate(..)`
### `<date>.getTimeStamp(..)`
### `<date>.setTimeStamp(..)`
## `String`
```javascript
require('ig-types/String')
```
### `<string>.capitalize()`
## `RegExp`
```javascript
require('ig-types/RegExp')
```
### `RegExp.quoteRegExp(..)`
## `Promise`
```javascript
require('ig-types/Promise')
```
or
```javascript
var promise = require('ig-types/Promise')
```
### Cooperative promises
#### `Promise.cooperative(..)`
#### `<promise-coop>.set(..)`
#### `<promise-coop>.isSet`
### Promise iteration
An _iterable promise_ is on one hand very similar to `Promise.all(..)` in that it
generally takes a list of values each could be either an explicit value or a
promise, and it is similar to a _generator_ in that allows iteration over the
contained values and chaining of operations but unlike `Promise.all(..)` this
iteration occurs depth first instead of breadth first.
Essentially one can think about _promise iterators_ vs. _generators_ as the former
being internally controlled and asynchronous while the later being externally
controlled and synchronous.
Here is a traditional example using `Promise.all(..)`:
```javascript
var p = Promise.all([ .. ])
// this will not execute until ALL the inputs resolve...
.then(function(lst){
return lst
.filter(function(e){
})
// this will not run until ALL of lst is filtered...
.map(function(e){
}) })
```
```javascript
var p = Promise.iter([ .. ])
// each element is processed as soon as it is ready disregarding of its order
// in the input array...
.filter(function(e){
})
// items reach here as soon as they are returned by the filter stage...
// NOTE: the filter handler may return promises, those will not be processed
// until they are resolved...
.map(function(e){
})
// .then(..) explicitly waits for the whole list of inputs to resolve...
.then(function(lst){
})
```
This approach has a number of advantages:
- items are processed as soon as they are available without waiting for the
slowest promise on each level to resolve
- simpler and more intuitive code
And some disadvantages:
- item indexes are unknowable until all the promises resolve.
#### `Promise.iter(..)` / `promise.IterablePromise(..)`
Create an _iterable promise_
```
Promise.iter(<array>)
-> <iterable-promise>
```
#### `<promise-iter>.map(..)` / `<promise-iter>.filter(..)` / `<promise-iter>.reduce(..)`
#### `<promise-iter>.flat(..)`
#### `<promise-iter>.then(..)` / `<promise-iter>.catch(..)` / `<promise-iter>.finally(..)`
#### Advanced handler
```bnf
Promise.iter(<block-array>, <handler>)
-> <iterable-promise>
<handler>(<elem>)
-> [ <elems> ]
```
```bnf
<block-array> ::=
[]
| [ <block-elem>, .. ]
<block-elem> ::=
[]
| [ <value>, .. ]
| <promise>
| <non-array>
```
Example:
```javascript
var p = Promise.iter(
// NOTE: if you want an element to explicitly be an array wrap it in
// an array -- like the last element here...
[[1, 2], 3, Promise.resolve(4), [[5, 6]]],
function(elem){
return elem % 2 == 0 ?
[elem, elem]
: elem instanceof Array ?
[elem]
: [] })
.then(function(lst){
console.log(lst) // -> [2, 2, 4, 4, [5, 6]]
})
```
## Generator extensions and utilities
```javascript
var generator = require('ig-types/generator')
```
### The basics
#### `Generator`
#### `generator.iter(..)`
### Generator instance iteration
#### `<generator>.map(..)` / `<generator>.filter(..)` / `<generator>.reduce(..)` / `<generator>.flat()`
#### `<generator>.promise()`
#### `<generator>.then(..)` / `<generator>.catch(..)` / `<generator>.finally(..)`
#### `<generator>.toArray()`
### Generator constructor iteration
```javascript
var sumOdds = generator.iter
.filter(function(e){
return e % 2 == 1 })
.reduce(function(r, e){
return r + e }, 0)
.pop()
console.log(sumOdds([1, 2, 3])) // -> 4
console.log(sumOdds([1, 2, 3, 4, 5, 6, 7])) // -> 16
```
The above code is the same in function to:
```javascript
var sumOdds = function(lst){
return generator.iter(lst)
.filter(function(e){
return e % 2 == 1 })
.reduce(function(r, e){
return r + e }, 0)
.pop() }
console.log(sumOdds([1, 2, 3])) // -> 4
console.log(sumOdds([1, 2, 3, 4, 5, 6, 7])) // -> 16
```
#### `Generator.at(..)`
#### `Generator.shift()` / `Generator.pop()`
#### `Generator.slice(..)`
This is like `Array`'s `.slice(..)` but does not support negative indexes.
#### `Generator.map(..)` / `Generator.filter(..)` / `Generator.reduce(..)` / `Generator.flat()`
#### `Generator.toArray()`
#### `Generator.then(..)` / `Generator.catch(..)` / `Generator.finally(..)`
## Containers
```javascript
var containers = require('ig-types').containers
```
or, to only import containers:
```javascript
var containers = require('ig-types/containers')
```
Note that this will also import `ig-types/Map`.
### `containers.UniqueKeyMap()` (`Map`)
`UniqueKeyMap` implements a key-value container (i.e. `Map`) that supports
and maintains _duplicate_ keys by appending an index to them.
The original keys are stored internally thus the renaming mechanics are
stable.
`UniqueKeyMap` extends the `Map` constructor, so all the usual `Map`
methods and properties apply here.
To construct an instance:
```javascript
var x = new UniqueKeyMap()
```
or:
```javascript
// new is optional...
var y = UniqueKeyMap()
```
`UniqueKeyMap` supports the same initialization signature as `Map` but
treats repeating keys differently.
```javascript
var z = UniqueKeyMap([['a', 1], ['a', 2], ['b', 1]])
```
The second `"a"` item will automatically get re-keyed as `"a (1)"`:
```javascript
console.log([...z.keys()]) // -> ['a', 'a (1)', 'b']
```
Note that `.set(..)` will never rewrite an element:
```javascript
z.set('a', 3)
console.log([...z.keys()]) // -> ['a', 'a (1)', 'b', 'a (2)']
z.get('a') // -> 1
z.get('a (1)') // -> 2
```
To get the generated key:
```javascript
var k = z.set('a', 4, true)
console.log(k) // -> 'a (3)'
```
To explicitly rewrite an item:
```javascript
z.reset('a (1)', 4)
z.get('a (1)') // -> 4
```
And we can _rename_ items, i.e. change their key:
```javascript
z.rename('a (2)', 'c')
console.log([...z.keys()]) // -> ['a', 'a (1)', 'b', 'a (3)', 'c']
```
For more info on `Map` see:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
#### `<unique-key-map>.set(..)`
```bnf
<unique-key-map>.reset(<key>, <item>)
-> <unique-key-map>
<unique-key-map>.reset(<key>, <item>, true)
-> <new-key>
```
Add an `<item>` to `<unique-key-map>`.
If `<key>` already exists then add an index to it to make it unique.
Key updating is done via [`<unique-key-map>.__key_pattern__`](#unique-key-map__key_pattern__).
#### `<unique-key-map>.reset(..)`
```bnf
<unique-key-map>.reset(<key>, <item>)
-> <unique-key-map>
```
Explicitly write an `<item>` under `<key>` as-is, this is like `Map`'s `.set(..)`.
#### `<unique-key-map>.rename(..)`
```bnf
<unique-key-map>.rename(<from-key>, <to-key>)
-> <unique-key-map>
<unique-key-map>.rename(<from-key>, <to-key>, true)
-> <new-key>
```
Rename item key from `<from-key>` to `<to-key>`.
Same mechanics apply as for [`.set(..)`](#unique-key-mapset) for key uniqueness.
Note, if [`.__unordered_rename__`](#unique-key-map__unordered_rename__) is
`false` (default) this calls [`.orderedRename(..)`](#unique-key-maporderedrename)
otherwise [`.unorderedRename(..)`](#unique-key-mapunorderedrename) is called.
#### `<unique-key-map>.orderedRename(..)`
#### `<unique-key-map>.unorderedRename(..)`
#### `<unique-key-map>.keysOf(..)`
#### `<unique-key-map>.originalKey(..)`
#### `<unique-key-map>.uniqueKey(..)`
#### `<unique-key-map>.__key_pattern__`
#### `<unique-key-map>.__unordered_rename__`
## Event
```javascript
var event = require('ig-types/event')
```
### `event.Eventfull(..)`
### `event.Event(..)`
### `event.TRIGGER`
Special value when passed to an event method as first argument will force it
to trigger event if the first argument was a function.
### `event.EventHandlerMixin`
#### `<obj>.on(..)`
#### `<obj>.one(..)`
#### `<obj>.off(..)`
#### `<obj>.trigger(..)`
### `event.EventDocMixin`
#### `<obj>.eventfull`
#### `<obj>.events`
### `event.EventMixin`
Combines [`event.EventHandlerMixin`](#eventeventhandlermixin) and
[`event.EventDocMixin`](#eventeventdocmixin).
## Runner
```javascript
var runner = require('ig-types/runner')
```
### Micro task queue
This includes [`event.EventMixin`](#eventeventmixin).
#### `Queue(..)` / `Queue.runTasks(..)`
#### `Queue.handle(..)`
Create a handler queue object.
```bnf
Queue.handle(<func>, ...<data>)
Queue.handle(<options>, <func>, ...<data>)
-> <queue>
```
A handler queue is a queue that has a single handler function (`.handle(..)`)
that handles the queue data.
This is a shorthand for:
```javascript
var handler_queue = Queue({
handler: function(item){ .. },
..
},
.. )
```
#### `<queue>.state`
#### `<queue>.start(..)`
#### `<queue>.stop(..)`
#### `<queue>.then(..)`
#### `<queue>.runTask(..)`
#### `<queue>.tasksAdded(..)` (event)
#### `<queue>.taskStarting(..)` (event)
#### `<queue>.taskFailed(..)` (event)
#### `<queue>.taskCompleted(..)` (event)
Event, triggered when a task is completed passing in its result.
#### `<queue>.queueEmpty(..)` (event)
### Large task management
#### `runner.TaskManager(..)`
This includes [`event.EventMixin`](#eventeventmixin).
#### `<task-manager>.Task(..)`
#### `<task-manager>.sync_start`
#### `<task-manager>.record_times`
#### `<task-manager>.titled(..)`
#### `<task-manager>.send(..)`
#### `<task-manager>.stop(..)`
#### `<task-manager>.done(..)` (event)
#### `<task-manager>.error(..)` (event)
#### `<task-manager>.tasksDone(..)` (event)
#### `runner.TaskTicket(..)`
#### `runner.TaskMixin(..)`
## License
[BSD 3-Clause License](./LICENSE)
Copyright (c) 2020, Alex A. Naanou,
All rights reserved.
<!-- vim:set ts=4 sw=4 spell : -->
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