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Pure functions / impure functions
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Pure functions</title> | |
| </head> | |
| <body> | |
| <p>Reference: <a href="https://egghead.io/lessons/javascript-redux-pure-and-impure-functions">Egghead</a></p> | |
| <script id="jsbin-javascript"> | |
| // Pure functions | |
| "use strict"; | |
| function square(x) { | |
| return x * x; | |
| } | |
| function squareAll(items) { | |
| return items.map(square); | |
| } | |
| // Impure functions | |
| function square(x) { | |
| updateXInDatabase(x); | |
| return x * x; | |
| } | |
| function squareAll(items) { | |
| for (var i = 0; i < items.length; i++) { | |
| items[i] = square(items[i]); | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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