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tswistak/params.js

Created July 30, 2018 06:13
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TypeScript 3.0, listing 6
Raw
params.js
function compose2<T1 extends any[], T1R, T2>(f1: (...args1: T1) => T1R, f2: (arg: T1R) => T2) {
return (...a: T1) => f2(f1(...a));
}
const add = (x: number, y: number) => x + y;
const sqr = (x: number) => x * x;
const addAndSqr = compose2(add, sqr);
addAndSqr(1, 2); // valid
addAndSqr('a', 2); // invalid type
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