Function replacePrefix

replace the prefix of of a given input string with the given replace value. if a matching prefix is not found, then undefined will be returned.

Example

import { assertEquals } from "jsr:@std/assert"

// aliasing our function for brevity
const
	eq = assertEquals,
	fn = replacePrefix

eq(fn("hello-world/abc-123", "hello-", "goodbye-"), "goodbye-world/abc-123")
eq(fn("hello-world/abc-123", "hello-"),             "world/abc-123")
eq(fn("hello-world/abc-123", "abc"),                undefined)
eq(fn("hello-world/abc-123", ""),                   "hello-world/abc-123")
eq(fn("hello-world/abc-123", "", "xyz-"),           "xyz-hello-world/abc-123")
  • replacePrefix(input: string, prefix: string, value?: string): undefined | string

    Parameters

    • input: string

      the input string to apply the prefix replacement to.

    • prefix: string

      the prefix string of the input to replace.

    • value: string = ""

      the optional value to replace the the prefix with. defaults to "" (empty string).

    Returns undefined | string

    if a matching prefix is found in the input, then it will be replaced with the given value. otherwise, undefined will be returned if the input does not begin with the prefix.

Settings

Member Visibility