match

match<T, R>(conditions): (input) => R | undefined

Defined in: logic/match.ts:25

Returns a function which encapsulates if/else logic based on a provided array of condition-action pairs.

Type Parameters

T

T

R

R

Parameters

conditions

[(input) => boolean, (input) => R][]

An array of tuples, each containing a predicate function and an action function

Returns

A function that takes an input and returns the result of the first matching action

(input): R | undefined

Parameters

input

T

Returns

R | undefined

Example

const isEven = (n: number) => n % 2 === 0;
const isOdd = (n: number) => n % 2 !== 0;
const double = (n: number) => n * 2;
const triple = (n: number) => n * 3;
const processNumber = match<number, number>([
  [isEven, double],
  [isOdd, triple],
]);

console.log(processNumber(4)); // Outputs: 8 (4 is even, so double it)
console.log(processNumber(5)); // Outputs: 15 (5 is odd, so triple it)