- Author:
- David Nickerson <david.nickerson@gmail.com>
- Date:
- 2021-09-17 15:50:49+12:00
- Desc:
- tweak html formatting
- Permanent Source URI:
- https://models.fieldml.org/workspace/a1/rawfile/1b3862589abf79ae9119ee0b5e99a8b785d762e1/dojo-presentation/js/dojo/dojox/lang/functional/reversed.js
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
}
});
})();
