Design HashMap LeetCode solution in JavaScript

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var MyHashMap = function () {
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  this.hashMap = [];
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};
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/**
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 * @param {number} key
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 * @param {number} value
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 * @return {void}
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 */
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MyHashMap.prototype.put = function (key, value) {
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  this.hashMap[key] = [key, value];
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};
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/**
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 * @param {number} key
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 * @return {number}
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 */
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MyHashMap.prototype.get = function (key) {
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  return this.hashMap[key] ? this.hashMap[key][1] : -1;
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};
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/**
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 * @param {number} key
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 * @return {void}
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 */
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MyHashMap.prototype.remove = function (key) {
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  delete this.hashMap[key];
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};
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/**
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 * Your MyHashMap object will be instantiated and called as such:
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 * var obj = new MyHashMap()
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 * obj.put(key,value)
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 * var param_2 = obj.get(key)
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 * obj.remove(key)
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 */