Function beginsWith

test/angular/1.4/angular.js:11724–11728

* * @param {string} begin * @param {string} whole * @returns {string} returns text from whole after begin or undefined if it does not begin with * expected string.

(begin, whole)

 *                   expected string.
 */
function beginsWith(begin, whole) {
  if (whole.indexOf(begin) === 0) {
    return whole.substr(begin.length);
  }
}


function stripHash(url) {