text: const isArrayLike = require('./type/is-array-like');
  
  const indexOf = function(arr, obj) {
    if (!isArrayLike(arr)) {
      return -1;
    }
    const m = Array.prototype.indexOf;
    if (m) {
      return m.call(arr, obj);
    }
    let index = -1;
  
    for (let i = 0; i < arr.length; i++) {
      if (arr[i] === obj) {
        index = i;
        break;
      }
    }
    return index;
  };
  
  module.exports = indexOf;
  