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| "use strict" | |
| function createEvaluator() { | |
| let evaluator; | |
| return { | |
| add: ( function(fn, ...rest) { | |
| const lastFn = fn.bind(null, ...rest), currenntFn = evaluator; | |
| evaluator = evaluator ? (...finalArrgs) => lastFn(currenntFn(...finalArrgs)) : lastFn | |
| return this; | |
| }), | |
| evaluate: arr => arr.map(el => evaluator(el)) | |
| } | |
| } | |
| createEvaluator() | |
| .add(Math.abs) | |
| .add(Math.sqrt) | |
| .add((a, b) => a + b, -1) | |
| .evaluate([-9, 36, 144]) | |
| // response [2, 5, 11] |
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| const compose = (...fns) => | |
| fns.reduce( | |
| (f, g) => | |
| (...args) => | |
| f(g(...args)) | |
| ) |
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Lazy Evaluation and Function composition