callback-chain-resolver

• GitHub
• NPM

Version 16 introduces series and parallel functions and removes earlier functions.

Helps you generate values out of functions in series or in parallel.

Installation

npm i callback-chain-resolver

Usage example

1
2import {series, parallel} from 'callback-chain-resolver'
3
4const incrementBy1 = (x) => x + 1;
5const decrementBy1 = (x) => x - 1;
6const double = x => 2 * x
7const square = x => x * x
8const cube = x => x * square(x)
9
10series(1, [incrementBy1, incrementBy1, incrementBy1]) // === 4
11series(1, [incrementBy1, incrementBy1, incrementBy1, double, square]) // === 64
12series(1, [incrementBy1, incrementBy1, incrementBy1, cube]) // === 64
13series(1, [decrementBy1, decrementBy1, decrementBy1]) // === -2
14series(1, [incrementBy1, decrementBy1]) // === 1
15series(1, [incrementBy1, cube, decrementBy1]) // === 7
16series(1, [decrementBy1, incrementBy1]) // === 1
17
18parallel(1, [incrementBy1, incrementBy1, incrementBy1]) // === [2, 2, 2]
19parallel(1, [incrementBy1, incrementBy1, incrementBy1, double, square]) // [2, 2, 2, 2, 1]
20

Check test cases for more examples.

typed

Throws compile time error if you pass mixed output type functions.

For example when you add toString to the typedResolver test cases.

1TS2345: Argument of type '(((x: number) => number) | ((x: number) => string))[]' is not assignable to parameter of type 'FnT<number>[]'.
2    Type '((x: number) => number) | ((x: number) => string)' is not assignable to type 'FnT<number>'.
3    Type '(x: number) => string' is not assignable to type 'FnT<number>'.
4    Type 'string' is not assignable to type 'number'

Use any in <any> while invoking mixed functions.

License

MIT © 2016 - 2021