dojo.provide("dojox.lang.functional.zip");

// This module adds high-level functions and related constructs:
//	- zip combiners

// Defined methods:
//	- operate on dense arrays

(function(){
	var df = dojox.lang.functional;

	dojo.mixin(df, {
		// combiners
		zip: function(){
			// summary: returns an array of arrays, where the i-th array 
			//	contains the i-th element from each of the argument arrays.
			// description: This is the venerable zip combiner (for example,
			//	see Python documentation for general details). The returned
			//	array is truncated to match the length of the shortest input
			//	array.
			var n = arguments[0].length, m = arguments.length, i = 1, t = new Array(n), j, p;
			for(; i < m; n = Math.min(n, arguments[i++].length));
			for(i = 0; i < n; ++i){
				p = new Array(m);
				for(j = 0; j < m; p[j] = arguments[j][i], ++j);
				t[i] = p;
			}
			return t;	// Array
		},
		unzip: function(/*Array*/ a){
			// summary: similar to dojox.lang.functional.zip(), but takes 
			//	a single array of arrays as the input.
			// description: This function is similar to dojox.lang.functional.zip() 
			//	and can be used to unzip objects packed by 
			//	dojox.lang.functional.zip(). It is here mostly to provide 
			//	a short-cut for the different method signature.
			return df.zip.apply(null, a);	// Array
		}
	});
})();