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December 4, 2016 22:39
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Understanding what pure functions are
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| // https://medium.com/javascript-scene/master-the-javascript-interview-what-is-a-pure-function-d1c076bec976#.8n6883iyc | |
| // Definition of a pure function | |
| // Given the same inputs, a pure function will always return the same output, | |
| // regardless of the number of times the function is called. | |
| // Memorization and pure function goes well togther. Since pure function always return a predicatable value, | |
| // this value can be cache using memorization. | |
| // Non Pure | |
| var z; | |
| function add(x, y) { | |
| return x + y + z; | |
| } | |
| // Pure | |
| function add(x, y) { | |
| return x + y; | |
| } |
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