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7.8.6 splice()

a.slice(3); // Returns [4,5] a.slice(1,-1); // Returns [2,3,4] a.slice(-3,-2); // Returns [3]


7.8.6 splice()

The Array.splice() method is a general-purpose method for inserting or removing elements from an array. Unlike slice() and concat(), splice() modifies the array on which it is invoked. Note that splice() and slice() have very similar names but perform substantially different operations.

splice() can delete elements from an array, insert new elements into an array, or perform both operations at the same time. Elements of the array that come after the insertion or deletion point have their indexes increased or decreased as necessary so that they remain contiguous with the rest of the array. The first argument to splice()specifies the array position at which the insertion and/or deletion is to begin. The second argument specifies the number of elements that should be deleted from (spliced out of) the array. If this second argument is omitted, all array elements from the start element to the end of the array are removed. splice() returns an array of the deleted elements, or an empty array if no elements were deleted. For example:

var a = [1,2,3,4,5,6,7,8]; a.splice(4); // Returns [5,6,7,8]; a is [1,2,3,4] a.splice(1,2); // Returns [2,3]; a is [1,4] a.splice(1,1); // Returns [4]; a is [1]

The first two arguments to splice() specify which array elements are to be deleted. These arguments may be followed by any number of additional arguments that specify elements to be inserted into the array, starting at the position specified by the first argument. For example:

var a = [1,2,3,4,5]; a.splice(2,0,'a','b'); // Returns []; a is [1,2,'a','b',3,4,5] a.splice(2,2,[1,2],3); // Returns ['a','b']; a is [1,2,[1,2],3,3,4,5]

Note that, unlike concat(), splice()inserts arrays themselves, not the elements of those arrays.

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