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cache-with-time-limit.js
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cache-with-time-limit.js
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var TimeLimitedCache = function() {
this.cache = new Map()
};
/**
* @param {number} key
* @param {number} value
* @param {number} time until expiration in ms
* @return {boolean} if un-expired key already existed
*/
TimeLimitedCache.prototype.set = function(key, value, duration) {
const inCache = this.cache.has(key)
if (inCache) {
clearTimeout(this.cache.get(key).timeout);
}
const timeout = setTimeout(() => {
this.cache.delete(key)
}, duration);
this.cache.set(key, { value, timeout });
return inCache
};
/**
* @param {number} key
* @return {number} value associated with key
*/
TimeLimitedCache.prototype.get = function(key) {
const isExistCache = this.cache.has(key)
return isExistCache ? this.cache.get(key).value : -1
};
/**
* @return {number} count of non-expired keys
*/
TimeLimitedCache.prototype.count = function() {
return this.cache.size
};
/**
* Your TimeLimitedCache object will be instantiated and called as such:
* var obj = new TimeLimitedCache()
* obj.set(1, 42, 1000); // false
* obj.get(1) // 42
* obj.count() // 1
*/