substance/util/startsWith.js

Substance is a JavaScript library for web-based content editing. It provides building blocks for realizing custom text editors and web-based publishing systems.

import isString from './isString'

export default function startsWith(str, prefix) {
  if (!isString(str)) return false
  if (str.startsWith) return str.startsWith(prefix)
  if (!isString(prefix)) prefix = String(prefix)
  return str.slice(0, prefix.length) === prefix
}