39 lines
898 B
TypeScript
39 lines
898 B
TypeScript
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/**
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* Functions that does nothing (useful for default callbacks)
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*/
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export function nop(...args: any[]): any {
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}
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/**
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* Identity function (returns the sole argument untouched)
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*/
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export function identity<T>(input: T): T {
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return input;
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}
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/**
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* Partially apply fixed arguments to a function with named arguments
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*/
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export function partial<
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A extends object,
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PA extends Partial<A>,
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RA extends any[],
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R,
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>(
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fixedargs: PA,
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func: (args: A, ...rest: RA) => R,
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): (args: Omit<A, keyof PA>, ...rest: RA) => R {
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return (args: Omit<A, keyof PA>, ...rest: RA) =>
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func({ ...fixedargs, ...args } as any, ...rest);
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}
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/**
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* Pipe the result of a function as first parameter of another, to create a new function
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*/
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export function pipe<IN extends any[], INT, R>(
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f1: (...args: IN) => INT,
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f2: (value: INT) => R,
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): (...args: IN) => R {
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return (...args: IN) => f2(f1(...args));
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}
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