These elements will be inserted immediately before the starting index (again, this is the value passed as the first argument). the value passed as the first argument) will be removed.Īny subsequent arguments are optional, but if they’re present, they indicate the elements to add to the array. If it is set to 0, no items will be removed, but if it is omitted entirely, all elements beginning at the specified index (i.e. The second argument is optional, but if it’s provided, it specifies the number of elements to remove from the array. You can pass in a negative value as this argument if you’d like to start at the end of the array. The first argument, which is required, indicates the index in the array at which to begin adding or removing elements. splice() will always be an array of any items that were removed. It is used to alter the contents of an array by removing existing elements and/or adding new elements.

splice() method is a destructive array method, which means it modifies the array on which it is called (disclaimer: destructive methods can be risky, especially if you use the array in question elsewhere in your program, so proceed with caution). I’ve also included two solutions to the common chunking algorithm: one makes use of. I’ve put together this crash course on the ins-and-outs of each so that you can start splicing and slicing with confidence. It’s not always easy, though, to remember which is which. slice() are two incredibly useful methods to have in your toolkit.

Slice and splice in javascript