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more refactoring and testing...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2018-07-14 04:19:08 +03:00
parent e2fe2a1e55
commit b6f7bc369d
1 changed files with 21 additions and 5 deletions
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diff.js
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@ -48,19 +48,35 @@ var DIFF_TYPES = new Set([
//--------------------------------------------------------------------- //---------------------------------------------------------------------
// Helpers... // Helpers...
// zip(array, array, ...)
// -> [[item, item, ...], ...]
//
// zip(func, array, array, ...)
// -> [func(i, [item, item, ...]), ...]
//
var zip = function(func, ...arrays){ var zip = function(func, ...arrays){
var i = arrays[0] instanceof Array ? 0 : arrays.shift() var i = arrays[0] instanceof Array ? 0 : arrays.shift()
var s = new Array(arrays.length) if(func instanceof Array){
arrays arrays.splice(0, 0, func)
.forEach(function(a, j){ func = null
}
// build the zip item...
// NOTE: this is done this way to preserve array sparseness...
var s = arrays
.reduce(function(res, a, j){
a.length > i a.length > i
&& (s[j] = a[i]) }) && (res[j] = a[i])
return res
}, new Array(arrays.length))
return arrays return arrays
// check that at least one array is longer than i... // check that at least one array is longer than i...
.reduce(function(res, a){ .reduce(function(res, a){
return Math.max(res, i, a.length) }, 0) > i ? return Math.max(res, i, a.length) }, 0) > i ?
[func(i, s)] // collect zip item...
[func ? func(i, s) : s]
// get next...
.concat(zip(func, i+1, ...arrays)) .concat(zip(func, i+1, ...arrays))
// done...
: [] } : [] }
// XXX should we handle properties??? // XXX should we handle properties???