![]() ![]() The new array will then be returned at the end of the execution of function. Programmers are then free from the burden of tracking the state of the original array. When using javascript array slice, remember this function will not modify the original array. Elements of the original array are copied into the returned array as. Getting started with JavaScript array slice. In JavaScript, all standard built-in object-copy operations ( spread syntax, (), (), om(), Object.assign(), and Object.create()) create shallow copies rather than deep copies. It returns a shallow copy of elements from the original array. That behavior contrasts with the behavior of a deep copy, in which the source and copy are completely independent.įor shallow copies, it's important to understand that selectively changing the value of a shared property of an existing element in an object is different from assigning a completely new value to an existing element.įor example, if in a shallow copy named copy of an array object, the value of the copy element is, then the corresponding element in the source object will not change - because in that case, you're not just selectively changing a property of an existing array element that the shallow copy shares with the source object instead you're actually assigning a completely new value to that copy array element, just in the shallow copy. As a result, when you change either the source or the copy, you may also cause the other object to change too - and so, you may end up unintentionally causing changes to the source or copy that you don't expect. slice returns a sub-set of the original array, with the original array remaining untouched. 2nd Argument: Specifies at which level the endpoint should be. ![]() For Example: var arr1 1,5,8,9 arr1.slice(1) // 5,8,9 From the first index (5) it will return the elements. ![]() 1st Argument: Specifies from where the selection should be started. A shallow copy of an object is a copy whose properties share the same references (point to the same underlying values) as those of the source object from which the copy was made. An important consideration relating to the answer by insomniac is that splice and slice are two completely different functions, with the main difference being: splice manipulates the original array. Slice: The Slice method takes 2 arguments. ![]()
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