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Diffstat (limited to 'js/dojo/dojox/lang/functional/reversed.js')
| -rw-r--r-- | js/dojo/dojox/lang/functional/reversed.js | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/js/dojo/dojox/lang/functional/reversed.js b/js/dojo/dojox/lang/functional/reversed.js new file mode 100644 index 0000000..d049be9 --- /dev/null +++ b/js/dojo/dojox/lang/functional/reversed.js @@ -0,0 +1,76 @@ +//>>built +define("dojox/lang/functional/reversed", ["dojo/_base/lang", "dojo/_base/window" ,"./lambda"], + function(lang, win, df){ +// This module adds high-level functions and related constructs: +// - reversed versions of array-processing functions similar to standard JS functions + +// Notes: +// - this module provides reversed versions of standard array-processing functions: +// forEachRev, mapRev, filterRev + +// Defined methods: +// - take any valid lambda argument as the functional argument +// - operate on dense arrays +// - take a string as the array argument + +/*===== + var df = dojox.lang.functional; + =====*/ + lang.mixin(df, { + // JS 1.6 standard array functions, which can take a lambda as a parameter. + // Consider using dojo._base.array functions, if you don't need the lambda support. + filterRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ + // summary: creates a new array with all elements that pass the test + // implemented by the provided function. + if(typeof a == "string"){ a = a.split(""); } + o = o || win.global; f = df.lambda(f); + var t = [], v, i = a.length - 1; + for(; i >= 0; --i){ + v = a[i]; + if(f.call(o, v, i, a)){ t.push(v); } + } + return t; // Array + }, + forEachRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ + // summary: executes a provided function once per array element. + if(typeof a == "string"){ a = a.split(""); } + o = o || win.global; f = df.lambda(f); + for(var i = a.length - 1; i >= 0; f.call(o, a[i], i, a), --i); + }, + mapRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ + // summary: creates a new array with the results of calling + // a provided function on every element in this array. + if(typeof a == "string"){ a = a.split(""); } + o = o || win.global; f = df.lambda(f); + var n = a.length, t = new Array(n), i = n - 1, j = 0; + for(; i >= 0; t[j++] = f.call(o, a[i], i, a), --i); + return t; // Array + }, + everyRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ + // summary: tests whether all elements in the array pass the test + // implemented by the provided function. + if(typeof a == "string"){ a = a.split(""); } + o = o || win.global; f = df.lambda(f); + for(var i = a.length - 1; i >= 0; --i){ + if(!f.call(o, a[i], i, a)){ + return false; // Boolean + } + } + return true; // Boolean + }, + someRev: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){ + // summary: tests whether some element in the array passes the test + // implemented by the provided function. + if(typeof a == "string"){ a = a.split(""); } + o = o || win.global; f = df.lambda(f); + for(var i = a.length - 1; i >= 0; --i){ + if(f.call(o, a[i], i, a)){ + return true; // Boolean + } + } + return false; // Boolean + } + }); + + return df; +}); |
