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May 13, 2017 07:42
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Lazy evaluation in JavaScript
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| function delay(expressionAsFunction) { | |
| var result; | |
| var isEvaluated = false; | |
| return function () { | |
| if (!(isEvaluated || ((isEvaluated = true), false))) | |
| result = expressionAsFunction(); | |
| return result; | |
| }; | |
| } |