StringLength

Since 1.1.0

Get the length of a string at type level.

Signature

type StringLength<S extends string, Acc extends 0[] = []> = 
  S extends `${string}${infer Rest}`
    ? StringLength<Rest, [...Acc, 0]>
    : Acc['length']

Parameters

Parameter	Description
S	The string to measure

Examples

Basic Usage

import type { StringLength } from 'uni-types'

type A = StringLength<'hello'>   // 5
type B = StringLength<''>        // 0
type C = StringLength<'abc'>     // 3

Conditional Logic

type IsLongString<S extends string> = StringLength<S> extends 1 | 2 | 3
  ? 'short'
  : 'long'

Related

• PadStart - Pad string to length
• PadEnd - Pad string to length