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js array set value at index

Array.prototype.insert = function ( index, ...items ) {
    this.splice( index, 0, ...items );
};

//then

var arr = [ 'A', 'B', 'E' ];
arr.insert(2, 'C', 'D');

// => arr == [ 'A', 'B', 'C', 'D', 'E' ]
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