| 1 | define(["dojo/_base/lang", "dojo/_base/kernel" ,"./lambda"], |
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| 2 | function(lang, kernel, df){ |
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| 3 | // This module adds high-level functions and related constructs: |
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| 4 | // - reversed versions of array-processing functions similar to standard JS functions |
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| 5 | |
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| 6 | // Notes: |
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| 7 | // - this module provides reversed versions of standard array-processing functions: |
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| 8 | // forEachRev, mapRev, filterRev |
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| 9 | |
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| 10 | // Defined methods: |
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| 11 | // - take any valid lambda argument as the functional argument |
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| 12 | // - operate on dense arrays |
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| 13 | // - take a string as the array argument |
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| 14 | |
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| 15 | lang.mixin(df, { |
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| 16 | // JS 1.6 standard array functions, which can take a lambda as a parameter. |
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| 17 | // Consider using dojo._base.array functions, if you don't need the lambda support. |
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| 18 | filterRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ |
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| 19 | // summary: |
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| 20 | // creates a new array with all elements that pass the test |
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| 21 | // implemented by the provided function. |
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| 22 | if(typeof a == "string"){ a = a.split(""); } |
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| 23 | o = o || kernel.global; f = df.lambda(f); |
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| 24 | var t = [], v, i = a.length - 1; |
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| 25 | for(; i >= 0; --i){ |
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| 26 | v = a[i]; |
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| 27 | if(f.call(o, v, i, a)){ t.push(v); } |
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| 28 | } |
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| 29 | return t; // Array |
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| 30 | }, |
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| 31 | forEachRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ |
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| 32 | // summary: |
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| 33 | // executes a provided function once per array element. |
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| 34 | if(typeof a == "string"){ a = a.split(""); } |
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| 35 | o = o || kernel.global; f = df.lambda(f); |
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| 36 | for(var i = a.length - 1; i >= 0; f.call(o, a[i], i, a), --i); |
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| 37 | }, |
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| 38 | mapRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ |
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| 39 | // summary: |
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| 40 | // creates a new array with the results of calling |
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| 41 | // a provided function on every element in this array. |
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| 42 | if(typeof a == "string"){ a = a.split(""); } |
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| 43 | o = o || kernel.global; f = df.lambda(f); |
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| 44 | var n = a.length, t = new Array(n), i = n - 1, j = 0; |
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| 45 | for(; i >= 0; t[j++] = f.call(o, a[i], i, a), --i); |
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| 46 | return t; // Array |
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| 47 | }, |
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| 48 | everyRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ |
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| 49 | // summary: |
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| 50 | // tests whether all elements in the array pass the test |
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| 51 | // implemented by the provided function. |
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| 52 | if(typeof a == "string"){ a = a.split(""); } |
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| 53 | o = o || kernel.global; f = df.lambda(f); |
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| 54 | for(var i = a.length - 1; i >= 0; --i){ |
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| 55 | if(!f.call(o, a[i], i, a)){ |
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| 56 | return false; // Boolean |
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| 57 | } |
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| 58 | } |
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| 59 | return true; // Boolean |
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| 60 | }, |
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| 61 | someRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ |
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| 62 | // summary: |
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| 63 | // tests whether some element in the array passes the test |
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| 64 | // implemented by the provided function. |
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| 65 | if(typeof a == "string"){ a = a.split(""); } |
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| 66 | o = o || kernel.global; f = df.lambda(f); |
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| 67 | for(var i = a.length - 1; i >= 0; --i){ |
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| 68 | if(f.call(o, a[i], i, a)){ |
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| 69 | return true; // Boolean |
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| 70 | } |
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| 71 | } |
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| 72 | return false; // Boolean |
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| 73 | } |
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| 74 | }); |
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| 75 | |
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| 76 | return df; |
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| 77 | }); |
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