Design Linked List LeetCode solution in JavaScript

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var MyLinkedList = function () {
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  this.linked = [];
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};
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MyLinkedList.prototype.get = function (index) {
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  if (index < this.linked.length) {
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    return this.linked[index];
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  }
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  return -1;
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};
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MyLinkedList.prototype.addAtHead = function (val) {
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  this.linked.unshift(val);
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};
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MyLinkedList.prototype.addAtTail = function (val) {
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  this.linked.push(val);
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};
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MyLinkedList.prototype.addAtIndex = function (index, val) {
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  if (index <= this.linked.length) {
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    this.linked.splice(index, 0, val);
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  }
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};
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MyLinkedList.prototype.deleteAtIndex = function (index) {
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  this.linked.splice(index, 1);
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};