array.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.lang.array");

dojo.require("dojo.lang.common");

// FIXME: Is this worthless since you can do: if(name in obj)
// is this the right place for this?
dojo.lang.has = function(/*Object*/obj, /*String*/name){
	try{
		return typeof obj[name] != "undefined";
	}catch(e){ return false; }
}

dojo.lang.isEmpty = function(/*Object*/obj){
	if(dojo.lang.isObject(obj)){
		var tmp = {};
		var count = 0;
		for(var x in obj){
			if(obj[x] && (!tmp[x])){
				count++;
				break;
			} 
		}
		return count == 0;
	}else if(dojo.lang.isArrayLike(obj) || dojo.lang.isString(obj)){
		return obj.length == 0;
	}
}

dojo.lang.map = function(/*Array*/arr, /*Object|Function*/obj, /*Function?*/unary_func){
	var isString = dojo.lang.isString(arr);
	if(isString){
		// arr: String
		arr = arr.split("");
	}
	if(dojo.lang.isFunction(obj)&&(!unary_func)){
		unary_func = obj;
		obj = dj_global;
	}else if(dojo.lang.isFunction(obj) && unary_func){
		// ff 1.5 compat
		var tmpObj = obj;
		obj = unary_func;
		unary_func = tmpObj;
	}
	if(Array.map){
	 	var outArr = Array.map(arr, unary_func, obj);
	}else{
		var outArr = [];
		for(var i=0;i<arr.length;++i){
			outArr.push(unary_func.call(obj, arr[i]));
		}
	}
	if(isString) {
		return outArr.join(""); // String
	} else {
		return outArr; // Array
	}
}

dojo.lang.reduce = function(/*Array*/arr, initialValue, /*Object|null*/obj, /*Function*/binary_func){
	var reducedValue = initialValue;
	var ob = obj ? obj : dj_global;
	dojo.lang.map(arr, 
		function(val){
			reducedValue = binary_func.call(ob, reducedValue, val);
		}
	);
	return reducedValue;
}

// http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Array:forEach
dojo.lang.forEach = function(/*Array*/anArray, /*Function*/callback, /*Object?*/thisObject){
	if(dojo.lang.isString(anArray)){
		// anArray: String
		anArray = anArray.split(""); 
	}
	if(Array.forEach){
		Array.forEach(anArray, callback, thisObject);
	}else{
		// FIXME: there are several ways of handilng thisObject. Is dj_global always the default context?
		if(!thisObject){
			thisObject=dj_global;
		}
		for(var i=0,l=anArray.length; i<l; i++){ 
			callback.call(thisObject, anArray[i], i, anArray);
		}
	}
}

dojo.lang._everyOrSome = function(/*Boolean*/every, /*Array*/arr, /*Function*/callback, /*Object?*/thisObject){
	if(dojo.lang.isString(arr)){ 
		//arr: String
		arr = arr.split(""); 
	}
	if(Array.every){
		return Array[ every ? "every" : "some" ](arr, callback, thisObject);
	}else{
		if(!thisObject){
			thisObject = dj_global;
		}
		for(var i=0,l=arr.length; i<l; i++){
			var result = callback.call(thisObject, arr[i], i, arr);
			if(every && !result){
				return false; // Boolean
			}else if((!every)&&(result)){
				return true; // Boolean
			}
		}
		return Boolean(every); // Boolean
	}
}

dojo.lang.every = function(/*Array*/arr, /*Function*/callback, /*Object?*/thisObject){
	return this._everyOrSome(true, arr, callback, thisObject); // Boolean
}

dojo.lang.some = function(/*Array*/arr, /*Function*/callback, /*Object?*/thisObject){
	return this._everyOrSome(false, arr, callback, thisObject); // Boolean
}

dojo.lang.filter = function(/*Array*/arr, /*Function*/callback, /*Object?*/thisObject){
	var isString = dojo.lang.isString(arr);
	if(isString){ /*arr: String*/arr = arr.split(""); }
	var outArr;
	if(Array.filter){
		outArr = Array.filter(arr, callback, thisObject);
	} else {
		if(!thisObject){
			if(arguments.length >= 3){ dojo.raise("thisObject doesn't exist!"); }
			thisObject = dj_global;
		}

		outArr = [];
		for(var i = 0; i < arr.length; i++){
			if(callback.call(thisObject, arr[i], i, arr)){
				outArr.push(arr[i]);
			}
		}
	}
	if(isString){
		return outArr.join(""); // String
	} else {
		return outArr; // Array
	}
}

dojo.lang.unnest = function(/* ... */){
	// summary:
	//	Creates a 1-D array out of all the arguments passed,
	//	unravelling any array-like objects in the process
	//
	// usage:
	//	unnest(1, 2, 3) ==> [1, 2, 3]
	//	unnest(1, [2, [3], [[[4]]]]) ==> [1, 2, 3, 4]

	var out = [];
	for(var i = 0; i < arguments.length; i++){
		if(dojo.lang.isArrayLike(arguments[i])){
			var add = dojo.lang.unnest.apply(this, arguments[i]);
			out = out.concat(add);
		}else{
			out.push(arguments[i]);
		}
	}
	return out; // Array
}

dojo.lang.toArray = function(/*Object*/arrayLike, /*Number*/startOffset){
	// summary:
	//	Converts an array-like object (i.e. arguments, DOMCollection)
	//	to an array
	var array = [];
	for(var i = startOffset||0; i < arrayLike.length; i++){
		array.push(arrayLike[i]);
	}
	return array; // Array
}