4 A collection of Array methods and functions.
11 Function: Array.each {#Array:Array-each}
12 ----------------------------------
14 Used to iterate through arrays, or iterables that are not regular arrays, such as built in getElementsByTagName calls or arguments of a function.
18 Array.each(iterable, fn[, bind]);
22 1. iterable - (*array*) The array to iterate through.
23 2. fn - (*function*) The function to test for each element.
24 3. bind - (*object*, optional) The object to use as 'this' within the function. For more information see [Function:bind][].
30 fn(item, index, object)
34 1. item - (*mixed*) The current item in the array.
35 2. index - (*number*) The current item's index in the array. In the case of an object, it is passed the key of that item rather than the index.
36 3. object - (*mixed*) The actual array/object.
40 Array.each(['Sun', 'Mon', 'Tue'], function(day, index){
41 alert('name:' + day + ', index: ' + index);
42 }); // alerts 'name: Sun, index: 0', 'name: Mon, index: 1', etc.
46 - [Array:each](#Array:each)
50 This is an array-specific equivalent of *$each* from MooTools 1.2.
54 Function: Array.clone {#Array:Array-clone}
55 ------------------------------------
57 Returns a copy of the passed array.
61 var clone = Array.clone(myArray);
65 1. myArray - (*array*) The array you wish to copy.
69 * (*array*) a copy of the passed array.
73 var myArray = ['red', 'blue', 'green'];
74 var otherArray = Array.clone(myArray);
76 var myArray[0] = 'yellow';
78 alert(myArray[0]); // alerts 'yellow'
79 alert(otherArray[0]) // alerts 'red'
83 This is an array-specific equivalent of *$unlink* from MooTools 1.2.
87 Function: Array.from {#Array:Array-from}
88 ----------------------------------
90 Converts the argument passed in to an array if it is defined and not already an array.
94 var splatted = Array.from(obj);
98 1. obj - (*mixed*) Any type of variable.
102 * (*array*) If the variable passed in is an array, returns the array. Otherwise, returns an array with the only element being the variable passed in.
106 Array.from('hello'); // returns ['hello'].
107 Array.from(['a', 'b', 'c']); // returns ['a', 'b', 'c'].
111 This is equivalent to *$splat* from MooTools 1.2.
115 Array method: each {#Array:each}
116 ---------------------------------
118 Calls a function for each element in the array.
122 myArray.each(fn[, bind]);
126 1. fn - (*function*) The function which should be executed on each item in the array. This function is passed the item and its index in the array.
127 2. bind - (*object*, optional) The object to be used as 'this' in the function. For more information see [Function:bind][].
133 fn(item, index, array)
137 1. item - (*mixed*) The current item in the array.
138 2. index - (*number*) The current item's index in the array.
139 3. array - (*array*) The actual array.
143 //Alerts "0 = apple", "1 = banana", and so on:
144 ['apple', 'banana', 'lemon'].each(function(item, index){
145 alert(index + " = " + item);
146 }); //The optional second argument for binding isn't used here.
151 - [Array.each](#Array:Array-each)
152 - [MDC Array:forEach][]
156 - This method is only available for browsers without native [MDC Array:forEach][] support.
163 Array method: invoke {#Array:invoke}
164 --------------------------
166 Returns an array with the named method applied to the array's contents.
170 var arr = myArray.invoke(method[, arg, arg, arg ...])
174 1. method - (*string*) The method to apply to each item in the array.
175 2. arg - (*mixed*) Any number of arguments to pass to the named method.
179 * (*array*) A new array containing the results of the applied method.
183 var foo = [4, 8, 15, 16, 23, 42];
184 var bar = foo.invoke('limit', 10, 30); //bar is now [10, 10, 15, 16, 23, 30]
188 Array method: every {#Array:every}
189 ----------------------------
191 Returns true if every element in the array satisfies the provided testing function.
192 This method is provided only for browsers without native [Array:every][] support.
196 var allPassed = myArray.every(fn[, bind]);
200 1. fn - (*function*) The function to test for each element.
201 2. bind - (*object*, optional) The object to use as 'this' in the function. For more information see [Function:bind][].
207 fn(item, index, array)
211 1. item - (*mixed*) The current item in the array.
212 2. index - (*number*) The current item's index in the array.
213 3. array - (*array*) The actual array.
217 * (*boolean*) If every element in the array satisfies the provided testing function, returns true. Otherwise, returns false.
221 var areAllBigEnough = [10, 4, 25, 100].every(function(item, index){
223 }); // areAllBigEnough = false
228 - [MDC Array:every][]
232 Array method: filter {#Array:filter}
233 ------------------------------
235 Creates a new array with all of the elements of the array for which the provided filtering function returns true.
236 This method is provided only for browsers without native [Array:filter][] support.
240 var filteredArray = myArray.filter(fn[, bind]);
244 1. fn - (*function*) The function to test each element of the array. This function is passed the item and its index in the array.
245 2. bind - (*object*, optional) The object to use as 'this' in the function. For more information see [Function:bind][].
251 fn(item, index, array)
255 1. item - (*mixed*) The current item in the array.
256 2. index - (*number*) The current item's index in the array.
257 3. array - (*array*) The actual array.
261 * (*array*) The new filtered array.
265 var biggerThanTwenty = [10, 3, 25, 100].filter(function(item, index){
267 }); // biggerThanTwenty = [25, 100]
271 - [MDC Array:filter][]
275 Array method: clean {#Array:clean}
276 ----------------------------
278 Creates a new array with all of the elements of the array which are defined (i.e. not null or undefined).
282 var cleanedArray = myArray.clean();
286 * (*array*) The new filtered array.
290 var myArray = [null, 1, 0, true, false, 'foo', undefined, ''];
291 myArray.clean() // returns [1, 0, true, false, 'foo', '']
295 Array method: indexOf {#Array:indexOf}
296 --------------------------------
298 Returns the index of the first element within the array equal to the specified value, or -1 if the value is not found.
299 This method is provided only for browsers without native [Array:indexOf][] support.
303 var index = myArray.indexOf(item[, from]);
307 * (*number*) The index of the first element within the array equal to the specified value. If not found, returns -1.
311 1. item - (*object*) The item to search for in the array.
312 2. from - (*number*, optional: defaults to 0) The index of the array at which to begin the search.
316 ['apple', 'lemon', 'banana'].indexOf('lemon'); // returns 1
317 ['apple', 'lemon'].indexOf('banana'); // returns -1
321 - [MDC Array:indexOf][]
325 Array method: map {#Array:map}
326 ------------------------
328 Creates a new array with the results of calling a provided function on every element in the array.
329 This method is provided only for browsers without native [Array:map][] support.
333 var mappedArray = myArray.map(fn[, bind]);
337 1. fn - (*function*) The function to produce an element of the new Array from an element of the current one.
338 2. bind - (*object*, optional) The object to use as 'this' in the function. For more information see [Function:bind][].
344 fn(item, index, array)
348 1. item - (*mixed*) The current item in the array.
349 2. index - (*number*) The current item's index in the array.
350 3. array - (*array*) The actual array.
354 * (*array*) The new mapped array.
358 var timesTwo = [1, 2, 3].map(function(item, index){
360 }); //timesTwo = [2, 4, 6];
368 Array method: some {#Array:some}
369 --------------------------
371 Returns true if at least one element in the array satisfies the provided testing function.
372 This method is provided only for browsers without native [Array:some][] support.
376 var somePassed = myArray.some(fn[, bind]);
380 * (*boolean*) If at least one element in the array satisfies the provided testing function returns true. Otherwise, returns false.
384 1. fn - (*function*) The function to test for each element. This function is passed the item and its index in the array.
385 2. bind - (*object*, optional) The object to use as 'this' in the function. For more information see [Function:bind][].
391 fn(item, index, array)
395 1. item - (*mixed*) The current item in the array.
396 2. index - (*number*) The current item's index in the array.
397 3. array - (*array*) The actual array.
401 var isAnyBigEnough = [10, 4, 25, 100].some(function(item, index){
403 }); // isAnyBigEnough = true
411 Array method: associate {#Array:associate}
412 ------------------------------------
414 Creates an object with key-value pairs based on the array of keywords passed in and the current content of the array.
418 var associated = myArray.associate(obj);
422 1. obj - (*array*) Its items will be used as the keys of the object that will be created.
426 * (*object*) The new associated object.
430 var animals = ['Cow', 'Pig', 'Dog', 'Cat'];
431 var sounds = ['Moo', 'Oink', 'Woof', 'Miao'];
432 sounds.associate(animals);
433 // returns {'Cow': 'Moo', 'Pig': 'Oink', 'Dog': 'Woof', 'Cat': 'Miao'}
437 Array method: link {#Array:link}
438 --------------------------
440 Accepts an object of key / function pairs to assign values.
444 var result = myArray.link(object);
448 1. object - (*object*) An object containing key / function pairs must be passed to be used as a template for associating values with the different keys.
452 * (*object*) The new associated object.
456 var el = document.createElement('div');
457 var arr2 = [100, 'Hello', {foo: 'bar'}, el, false];
459 myNumber: Type.isNumber,
460 myElement: Type.isElement,
461 myObject: Type.isObject,
462 myString: Type.isString,
463 myBoolean: function(obj){ return obj != null; }
465 // returns {myNumber: 100, myElement: el, myObject: {foo: 'bar'}, myString: 'Hello', myBoolean: false}
468 Array method: contains {#Array:contains}
469 ----------------------------------
471 Tests an array for the presence of an item.
475 var inArray = myArray.contains(item[, from]);
479 1. item - (*object*) The item to search for in the array.
480 2. from - (*number*, optional: defaults to 0) The index of the array at which to begin the search.
484 * (*boolean*) If the array contains the item specified, returns true. Otherwise, returns false.
488 ['a', 'b', 'c'].contains('a'); // returns true
489 ['a', 'b', 'c'].contains('d'); // returns false
493 - [MDC Array:indexOf][]
497 Array method: append {#Array:append}
498 ------------------------------
500 Appends the passed array to the end of the current array.
504 var myArray = myArray.append(otherArray);
508 1. otherArray - (*array*) The array containing values you wish to append.
512 * (*array*) The original array including the new values.
516 var myOtherArray = ['green', 'yellow'];
517 ['red', 'blue'].append(myOtherArray); // returns ['red', 'blue', 'green', 'yellow'];
521 This is an array-specific equivalent of *$extend* from MooTools 1.2.
525 Array method: getLast {#Array:getLast}
526 --------------------------------
528 Returns the last item from the array.
536 * (*mixed*) The last item in this array.
537 * (*null*) If this array is empty, returns null.
541 ['Cow', 'Pig', 'Dog', 'Cat'].getLast(); // returns 'Cat'
545 Array method: getRandom {#Array:getRandom}
546 ------------------------------------
548 Returns a random item from the array.
556 * (*mixed*) A random item from this array. If this array is empty, returns null.
560 ['Cow', 'Pig', 'Dog', 'Cat'].getRandom(); // returns one of the items
564 Array method: include {#Array:include}
565 --------------------------------
567 Pushes the passed element into the array if it's not already present (case and type sensitive).
571 myArray.include(item);
575 1. item - (*object*) The item that should be added to this array.
579 * (*array*) This array with the new item included.
583 ['Cow', 'Pig', 'Dog'].include('Cat'); // returns ['Cow', 'Pig', 'Dog', 'Cat']
584 ['Cow', 'Pig', 'Dog'].include('Dog'); // returns ['Cow', 'Pig', 'Dog']
588 If you want to push the passed element even if it's already present, use
589 the vanilla javascript:
593 Array method: combine {#Array:combine}
594 --------------------------------
596 Combines an array with all the items of another. Does not allow duplicates and is case and type sensitive.
600 myArray.combine(array);
604 1. array - (*array*) The array whose items should be combined into this array.
608 * (*array*) This array combined with the new items.
612 var animals = ['Cow', 'Pig', 'Dog'];
613 animals.combine(['Cat', 'Dog']); //animals = ['Cow', 'Pig', 'Dog', 'Cat'];
617 Array method: erase {#Array:erase}
618 ----------------------------
620 Removes all occurrences of an item from the array.
628 1. item - (*object*) The item to search for in the array.
632 * (*array*) This array with all occurrences of the item removed.
636 ['Cow', 'Pig', 'Dog', 'Cat', 'Dog'].erase('Dog') // returns ['Cow', 'Pig', 'Cat']
637 ['Cow', 'Pig', 'Dog'].erase('Cat') // returns ['Cow', 'Pig', 'Dog']
641 Array method: empty {#Array:empty}
642 ----------------------------
652 * (*array*) This array, emptied.
656 var myArray = ['old', 'data'];
657 myArray.empty(); //myArray is now []
660 Array method: flatten {#Array:flatten}
661 --------------------------------
663 Flattens a multidimensional array into a single array.
671 * (*array*) A new flat array.
675 var myArray = [1,2,3,[4,5, [6,7]], [[[8]]]];
676 var newArray = myArray.flatten(); //newArray is [1,2,3,4,5,6,7,8]
680 Array method: pick {#Array:pick}
681 --------------------------
682 Returns the first defined value of the array passed in, or null.
686 var picked = [var1, var2, var3].pick();
690 * (*mixed*) The first variable that is defined.
691 * (*null*) If all variables passed in are `null` or `undefined`, returns `null`.
695 function say(infoMessage, errorMessage){
696 alert([errorMessage, infoMessage, 'There was no message supplied.'].pick());
698 //or more MooTools 1.2 style using Generics
699 Array.pick([errorMessage, infoMessage, 'There was no message supplied.']);
702 say(); // alerts 'There was no message supplied.'
703 say('This is an info message.'); // alerts 'This is an info message.'
704 say('This message will be ignored.', 'This is the error message.'); // alerts 'This is the error message.'
709 This is equivalent to *$pick* from MooTools 1.2.
713 Array method: hexToRgb {#Array:hexToRgb}
714 ----------------------------------
716 Converts an hexadecimal color value to RGB. Input array must be the following hexadecimal color format.
721 myArray.hexToRgb([array]);
725 1. array - (*boolean*, optional) If true is passed, will output an array (e.g. \[255, 51, 0\]) instead of a string (e.g. "rgb(255, 51, 0)").
729 * (*string*) A string representing the color in RGB.
730 * (*array*) If the array flag is set, an array will be returned instead.
734 ['11', '22', '33'].hexToRgb(); // returns 'rgb(17, 34, 51)'
735 ['11', '22', '33'].hexToRgb(true); // returns [17, 34, 51]
739 - [String:hexToRgb](/Types/String/#hexToRgb)
743 Array method: rgbToHex {#Array:rgbToHex}
744 ----------------------------------
746 Converts an RGB color value to hexadecimal. Input array must be in one of the following RGB color formats.
747 \[255, 255, 255\], or \[255, 255, 255, 1\]
751 myArray.rgbToHex([array]);
755 1. array - (*boolean*, optional) If true is passed, will output an array (e.g. \['ff', '33', '00'\]) instead of a string (e.g. '#ff3300').
759 * (*string*) A string representing the color in hexadecimal, or 'transparent' string if the fourth value of rgba in the input array is 0 (rgba).
760 * (*array*) If the array flag is set, an array will be returned instead.
764 [17, 34, 51].rgbToHex(); // returns '#112233'
765 [17, 34, 51].rgbToHex(true); // returns ['11', '22', '33']
766 [17, 34, 51, 0].rgbToHex(); // returns 'transparent'
770 - [String:rgbToHex](/Types/String/#rgbToHex)
774 [Function:bind]: /core/Native/Function/#Function:bind
775 [MDC Array]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array
776 [MDC Array:every]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/every
777 [MDC Array:filter]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/filter
778 [MDC Array:indexOf]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/indexOf
779 [MDC Array:map]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/map
780 [MDC Array:some]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/some
781 [MDC Array:forEach]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/forEach
782 [Array:every]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/every
783 [Array:filter]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/filter
784 [Array:indexOf]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/indexOf
785 [Array:map]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/map
786 [Array:some]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/some