Slice leaves the original array intact and returns a shallow copy of selected items, splice modifies the original array. In this post we'll master the slice method by example, exploring 8 different ways it can be used.Ĭaution: The slice method is not to be confused with the splice method, which modifies an array in place. Thus it provides a key building block for writing functional JavaScript. The slice method provides a mechanism for creating a shallow copy of a subset of a list, without modifying the original list. The JavaScript array slice method fits both of these criteria.
You can omit the use of Array.slice() if you want to alter the original array in below examples.The JavaScript array slice method is one of the most powerful and commonly used built-ins in the JavaScript language.Īnd with the rise of React and other functionally oriented JavaScript practices, it is becoming even more important, for 2 key reasons: Take note that Array.slice() has been used before Array.splice() because we do not want to alter the original array. Let’s look at more examples using Array.splice() method.
Now we have extracted the secondPart using list.splice(-threePartIndex), which removes last 3 elements from remaining list = which is, at this point list contain only first 3 elements which is firstPart.We have first extracted the thirdPart using list.splice(-threePartIndex), which removes last 3 elements, at this point list contain only first 6 elements.
splice( - threePartIndex) Ĭonst secondPart = list. Const list = Ĭonst threePartIndex = Math.
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