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ECMA 5 Array method

List Iterator

ECMA-262, Array.prototype available these methods.

  1. map(iterator, list)
  2. each(iterator, list)
  3. every(iterator, list)
  4. some(iterator, list)
  5. reduce(iterator, list, opt_init)
  6. reduceRight(iterator, list, opt_init)

asArray utility

Array.prototype.slice.(apply|call)

This method has been used very often.

/**
 * @param {number} x
 * @param {...number} var_args
 * @return {number}
 */
function sum(x, var_args) {
  var args = Array.prototype.slice.apply(arguments),
        i, l, n = 0;
  for (i = 0, l = args.length; i < l; i++) {
    n += args[i];
  }
  return n;
}

supply shorthand method

implement asArray() method

asArray(); // []
asArray(null); // []
asArray(false); // [false]
asArray(0); // [0]
asArray(''); // []
asArray('foo'); // ['foo']
asArray(function (x, y) { return x + y }) // []
asArray(arguments); // [arg1, arg2, ... argn]

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