Created
February 4, 2020 12:34
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| function cached(fn){ | |
| // Create an object to store the results returned after each function execution. | |
| const cache = Object.create(null); | |
| // Returns the wrapped function | |
| return function cachedFn (str) { | |
| // If the cache is not hit, the function will be executed | |
| if ( !cache[str] ) { | |
| let result = fn(str); | |
| // Store the result of the function execution in the cache | |
| cache[str] = result; | |
| } | |
| return cache[str] | |
| } | |
| } | |
| function computed(str) { | |
| // Suppose the calculation in the funtion is very time consuming | |
| console.log('time consuming calculation'); | |
| return 'a result' | |
| } | |
| const computed_result = cached(computed); | |
| console.log(computed_result('ss')); | |
| // time consuming calculation | |
| // a result | |
| console.log(computed_result('ss')); | |
| // a result |
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