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De splice() methode past de inhoud van een array aan door bestaande elementen te verwijderen en/of nieuwe elementen toe te voegen.
Syntax
array.splice(start[, deleteCount[, item1[, item2[, ...]]]])
Parameters
start- Positie vanwaar de array dient te worden veranderd (met eerste element op 0). Indien groter dan de lengte van de array zal de
startworden omgezet naar de lengte van de array. Indien negatief begint hij het absolute aantal vanaf het einde van de array. deleteCount- Een getal dat aanduid hoeveel elementen moeten worden verwijderd. Indien 0 worden er geen elementen verwijdered. in dit scenario moet je minstens één toe te voegen element meegeven. Als de
deleteCountgroter is dan het overige aantal elementen in de array (beginnend bij de start waarde) worden alle deze overige elementen verwijderd. - Indien de
deleteCountniet word meegegeven word deze alsvolgt berekend: (arr.length - start).Dit heeft als resultaat dat alle elementen na de startwaarde worden verwijderd. item1, item2, ...- De elementen die in de array moeten worden toegevoegd, startende van de
startwaarde. Indien niet meegegeven zullen er enkel elementen uit de array verwijderd worden.
Return value
An array containing the deleted elements. If only one element is removed, an array of one element is returned. If no elements are removed, an empty array is returned.
Description
If you specify a different number of elements to insert than the number you're removing, the array will have a different length at the end of the call.
Examples
Using splice()
The following script illustrates the use of splice():
var myFish = ['angel', 'clown', 'mandarin', 'surgeon']; // removes 0 elements from index 2, and inserts 'drum' var removed = myFish.splice(2, 0, 'drum'); // myFish is ['angel', 'clown', 'drum', 'mandarin', 'surgeon'] // removed is [], no elements removed // myFish is ['angel', 'clown', 'drum', 'mandarin', 'surgeon'] // removes 1 element from index 3 removed = myFish.splice(3, 1); // myFish is ['angel', 'clown', 'drum', 'surgeon'] // removed is ['mandarin'] // myFish is ['angel', 'clown', 'drum', 'surgeon'] // removes 1 element from index 2, and inserts 'trumpet' removed = myFish.splice(2, 1, 'trumpet'); // myFish is ['angel', 'clown', 'trumpet', 'surgeon'] // removed is ['drum'] // myFish is ['angel', 'clown', 'trumpet', 'surgeon'] // removes 2 elements from index 0, and inserts 'parrot', 'anemone' and 'blue' removed = myFish.splice(0, 2, 'parrot', 'anemone', 'blue'); // myFish is ['parrot', 'anemone', 'blue', 'trumpet', 'surgeon'] // removed is ['angel', 'clown'] // myFish is ['parrot', 'anemone', 'blue', 'trumpet', 'surgeon'] // removes 2 elements from index 2 removed = myFish.splice(myFish.length -3, 2); // myFish is ['parrot', 'anemone', 'surgeon'] // removed is ['blue', 'trumpet'] const myFish = ['parrot', 'anemone', 'blue', 'trumpet', 'surgeon']; // removes 3 elements starting at index 2 const removed = myFish.splice(2); // myFish is ['parrot', 'anemone'] // removed is ['blue', 'trumpet', 'surgeon']
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.2. |
| ECMAScript 5.1 (ECMA-262) The definition of 'Array.prototype.splice' in that specification. |
Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Array.prototype.splice' in that specification. |
Standard | |
| ECMAScript 2017 Draft (ECMA-262) The definition of 'Array.prototype.splice' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 1.0 | 1.0 (1.7 or earlier) | 5.5 | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Backward compatibility
In JavaScript 1.2 the splice() method returns the element removed, if only one element is removed (deleteCount parameter is 1); otherwise, the method returns an array containing the removed elements.
Note: The last browser to use JavaScript 1.2 was Netscape Navigator 4, so you can depend on splice() always returning an array. This is the case, when a JavaScript object has a length property and a splice() method, console.log() treats it as an Array-like object. Checking with an instanceof Array on it returns false.