Implement compose() and pipe() for function composition

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**Approach:** `compose` reduces right-to-left: `(...args) => f(g(h(...args)))`. `pipe` is reverse. Provide async variants that await. ```javascript function compose(...fns) { if (fns.length === 0) return x => x; return function(...args) { let result = fns[fns.length - 1].apply(this, args); for (let i = fns.length - 2; i >= 0; i--) result = fns[i].call(this, result); return result; }; } function pipe(...fns) { if (fns.length === 0) return x => x; return function(...args) { let result = fns[0].apply(this, args); for (let i = 1; i < fns.length; i++) result = fns[i].call(this, result); return result; }; } function pipeAsync(...fns) { return async function(...args) { let res = await fns[0].apply(this, args); for (let i = 1; i < fns.length; i++) res = await fns[i].call(this, res); return res; }; } // Demo const add1 = x => x+1, double = x => x*2, toStr = x => String(x); console.log(compose(toStr, double, add1)(5)); // "12" (5+1=6*2=12 ->

Implement compose() and pipe() for function composition

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Join the discussion

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