Function until

until<T>(pred: (t: T) => boolean): (succ: (t: T) => T) => (init: T) => T

Repeats the succ operation until pred returns true.

Type Parameters

T

Parameters

pred: (t: T) => boolean
The predicate whether the operation is done.

Returns (succ: (t: T) => T) => (init: T) => T

The found value while operations.

Examples

Example

const padLeft = until((x: string) => 4 <= x.length)((x) => "0" + x);
expect(padLeft("")).toStrictEqual("0000");
expect(padLeft("1")).toStrictEqual("0001");
expect(padLeft("13")).toStrictEqual("0013");
expect(padLeft("131")).toStrictEqual("0131");
expect(padLeft("1316")).toStrictEqual("1316");
expect(padLeft("1316534")).toStrictEqual("1316534");