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76 lines
2.8 KiB
JavaScript
76 lines
2.8 KiB
JavaScript
15 years ago
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dojo.provide("dojox.lang.functional.reversed");
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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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// - reversed versions of array-processing functions similar to standard JS functions
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// Notes:
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// - this module provides reversed versions of standard array-processing functions:
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// forEachRev, mapRev, filterRev
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// Defined methods:
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// - take any valid lambda argument as the functional argument
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// - operate on dense arrays
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// - take a string as the array 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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// JS 1.6 standard array functions, which can take a lambda as a parameter.
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// Consider using dojo._base.array functions, if you don't need the lambda support.
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filterRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){
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// summary: creates a new array with all elements that pass the test
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// implemented by the provided function.
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if(typeof a == "string"){ a = a.split(""); }
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o = o || d.global; f = df.lambda(f);
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var t = [], v, i = a.length - 1;
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for(; i >= 0; --i){
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v = a[i];
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if(f.call(o, v, i, a)){ t.push(v); }
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}
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return t; // Array
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},
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forEachRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){
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// summary: executes a provided function once per array element.
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if(typeof a == "string"){ a = a.split(""); }
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o = o || d.global; f = df.lambda(f);
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for(var i = a.length - 1; i >= 0; f.call(o, a[i], i, a), --i);
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},
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mapRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){
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// summary: creates a new array with the results of calling
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// a provided function on every element in this array.
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if(typeof a == "string"){ a = a.split(""); }
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o = o || d.global; f = df.lambda(f);
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var n = a.length, t = new Array(n), i = n - 1, j = 0;
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for(; i >= 0; t[j++] = f.call(o, a[i], i, a), --i);
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return t; // Array
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},
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everyRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){
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// summary: tests whether all elements in the array pass the test
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// implemented by the provided function.
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if(typeof a == "string"){ a = a.split(""); }
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o = o || d.global; f = df.lambda(f);
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for(var i = a.length - 1; i >= 0; --i){
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if(!f.call(o, a[i], i, a)){
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return false; // Boolean
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}
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}
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return true; // Boolean
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},
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someRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){
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// summary: tests whether some element in the array passes the test
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// implemented by the provided function.
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if(typeof a == "string"){ a = a.split(""); }
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o = o || d.global; f = df.lambda(f);
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for(var i = a.length - 1; i >= 0; --i){
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if(f.call(o, a[i], i, a)){
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return true; // Boolean
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}
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}
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return false; // Boolean
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}
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});
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})();
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