substance/util/findIndex.js

Substance is a JavaScript library for web-based content editing. It provides building blocks for realizing custom text editors and web-based publishing system. It is developed to power our online editing platform [Substance](http://substance.io).

import isFunction from './isFunction'

export default function findIndex (arr, predicate) {
  if (!isFunction(predicate)) return arr.indexOf(predicate)
  for (let i = 0; i < arr.length; i++) {
    if (predicate(arr[i])) return i
  }
  return -1
}