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146.lru-cache.js
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146.lru-cache.js
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/*
* @lc app=leetcode id=146 lang=javascript
*
* [146] LRU Cache
*/
// @lc code=start
/**
* @param {number} capacity
*/
const LRUCache = function (capacity) {
this.m = new Map();
this.capacity = capacity;
};
/**
* @param {number} key
* @return {number}
*/
LRUCache.prototype.get = function (key) {
if (this.m.has(key)) {
// Remove and put key/value back into hash to move this key to the back (meaning recently used)
const value = this.m.get(key);
this.m.delete(key);
this.m.set(key, value);
return value;
}
return -1;
};
/**
* @param {number} key
* @param {number} value
* @return {void}
*/
LRUCache.prototype.put = function (key, value) {
if (this.m.has(key)) {
this.m.delete(key);
this.m.set(key, value);
} else if (this.m.size === this.capacity) {
const firstKey = this.m.keys().next().value;
this.m.delete(firstKey);
this.m.set(key, value);
} else { // Map has extra capacity
this.m.set(key, value);
}
};
/**
* Your LRUCache object will be instantiated and called as such:
* var obj = new LRUCache(capacity)
* var param_1 = obj.get(key)
* obj.put(key,value)
*/
// @lc code=end