31 lines
839 B
TypeScript
31 lines
839 B
TypeScript
import { identity, nop, partial, pipe } from "./composition.ts";
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import { expect, it } from "./deps.testing.ts";
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it("nop", () => {
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expect(nop()).toBeUndefined();
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});
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it("identity", () => {
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expect(identity(5)).toBe(5);
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expect(identity(null)).toBe(null);
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});
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it("partial", () => {
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const func1 = (conf: { a: number; b: string; c: number }) =>
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`${conf.a}${conf.b}${conf.c}`;
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const pfunc1 = partial({ b: "test" }, func1);
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expect(pfunc1({ a: 5, c: 8 })).toEqual("5test8");
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const func2 = (conf: { a: number; b: string }, c: number) =>
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`${conf.a}${conf.b}${c}`;
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const pfunc2 = partial({ b: "test" }, func2);
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expect(pfunc2({ a: 2 }, 3)).toEqual("2test3");
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});
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it("pipe", () => {
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const f = pipe((x: number) => x * 2, (x: number) => x + 1);
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expect(f(1)).toBe(3);
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expect(f(2)).toBe(5);
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expect(f(3)).toBe(7);
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});
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