80 lines
3 KiB
JavaScript
80 lines
3 KiB
JavaScript
|
if(!dojo._hasResource["dojox.lang.functional.reversed"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
|
||
|
|
dojo._hasResource["dojox.lang.functional.reversed"] = true;
|
||
|
|
dojo.provide("dojox.lang.functional.reversed");
|
||
|
|
|
||
|
|
dojo.require("dojox.lang.functional.lambda");
|
||
|
|
|
||
|
|
// 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
|
||
|
|
|
||
|
|
(function(){
|
||
|
|
var d = dojo, df = dojox.lang.functional;
|
||
|
|
|
||
|
|
d.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 || d.global; f = df.lambda(f);
|
||
|
|
var t = [], v;
|
||
|
|
for(var i = a.length - 1; 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 || d.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 || d.global; f = df.lambda(f);
|
||
|
|
var n = a.length, t = new Array(n);
|
||
|
|
for(var i = n - 1, j = 0; 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 || d.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 || d.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
|
||
|
|
}
|
||
|
|
});
|
||
|
|
})();
|
||
|
|
|
||
|
|
}
|