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41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
dojo.provide("dojox.lang.functional.zip");
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// This module adds high-level functions and related constructs:
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// - zip combiners
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// Defined methods:
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// - operate on dense arrays
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(function(){
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var df = dojox.lang.functional;
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dojo.mixin(df, {
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// combiners
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zip: function(){
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// summary: returns an array of arrays, where the i-th array
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// contains the i-th element from each of the argument arrays.
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// description: This is the venerable zip combiner (for example,
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// see Python documentation for general details). The returned
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// array is truncated to match the length of the shortest input
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// array.
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var n = arguments[0].length, m = arguments.length, i = 1, t = new Array(n), j, p;
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for(; i < m; n = Math.min(n, arguments[i++].length));
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for(i = 0; i < n; ++i){
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p = new Array(m);
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for(j = 0; j < m; p[j] = arguments[j][i], ++j);
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t[i] = p;
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}
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return t; // Array
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},
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unzip: function(/*Array*/ a){
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// summary: similar to dojox.lang.functional.zip(), but takes
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// a single array of arrays as the input.
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// description: This function is similar to dojox.lang.functional.zip()
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// and can be used to unzip objects packed by
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// dojox.lang.functional.zip(). It is here mostly to provide
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// a short-cut for the different method signature.
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return df.zip.apply(null, a); // Array
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}
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});
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})();
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