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38 lines
1.2 KiB
JavaScript
38 lines
1.2 KiB
JavaScript
15 years ago
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dojo.provide("dojox.lang.functional.sequence");
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dojo.require("dojox.lang.functional.lambda");
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// This module adds high-level functions and related constructs:
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// - sequence generators
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// If you want more general sequence builders check out listcomp.js and
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// unfold() (in fold.js).
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// Defined methods:
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// - take any valid lambda argument as the functional argument
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(function(){
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var d = dojo, df = dojox.lang.functional;
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d.mixin(df, {
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// sequence generators
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repeat: function(/*Number*/ n, /*Function|String|Array*/ f, /*Object*/ z, /*Object?*/ o){
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// summary: builds an array by repeatedly applying a unary function N times
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// with a seed value Z. N should be greater than 0.
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o = o || d.global; f = df.lambda(f);
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var t = new Array(n), i = 1;
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t[0] = z;
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for(; i < n; t[i] = z = f.call(o, z), ++i);
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return t; // Array
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},
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until: function(/*Function|String|Array*/ pr, /*Function|String|Array*/ f, /*Object*/ z, /*Object?*/ o){
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// summary: builds an array by repeatedly applying a unary function with
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// a seed value Z until the predicate is satisfied.
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o = o || d.global; f = df.lambda(f); pr = df.lambda(pr);
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var t = [];
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for(; !pr.call(o, z); t.push(z), z = f.call(o, z));
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return t; // Array
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}
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});
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})();
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