README.md

Match predicate

Function inspired by rust match case.

The function creates cached instance so it can be reused without reinitialization.

Usage

For simple operations:

import matchPredicate from "match-predicate";

const result = matchPredicate([
  [1, () => "Hello"],
  [2, () => "World"],
])(1);

Match statement is reusable:

import matchPredicate from "match-predicate";

const match = matchPredicate([
  [1, () => "Now we're thinking with match"],
  [2, () => "Wow"],
]);

console.log([match(2), match(1)].join(", "))

Match using a function:

import matchPredicate from "match-predicate";

const result = matchPredicate<number, string>([
  [(i) => i > 0, () => "It's getting more interesting"],
])(1);

Default values:

import matchPredicate from "match-predicate";

const match = matchPredicate<number, string>([
  [(i) => i > 0, () => "It's getting more interesting"],
])
const result = match(-1, "Oh no, nothing matched");

const result = match(-2, () => "It works with functions too");

Force an explicid definition with the 3'rd value:

import matchPredicate from "match-predicate";

enum EnumForExplicive {
  One,
  Two,
  Three,
}

console.log(
  matchPredicate<EnumForExplicive, boolean, true>([
    [EnumForExplicive.One, () => "Typescript"],
    [(i) => [EnumForExplicive.Two, EnumForExplicive.Three].includes(i), () => "Safe"],
  ])(EnumForExplicive.Three)
);