badsyntax/a.md

## a.md

      
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              a.md
            
          
    Write a function f(a, b) which takes two strings as arguments and returns a string containing only the characters found in both strings, in the order that they appeared in a.
Original implementation found here: https://github.com/blakeembrey/code-problems/blob/master/common-string-filter/index.js

  
## f.js
function f(a, b) {

  a = a.split('');
  b = Array.prototype.slice.call(arguments, 1).join('').split('');

  return a.filter(function(val, i, arr) {
    return ~b.indexOf(val) && a.indexOf(val) === i
  }).join('')
}
	function f(a, b) {

	a = a.split('');
	b = Array.prototype.slice.call(arguments, 1).join('').split('');

	return a.filter(function(val, i, arr) {
	return ~b.indexOf(val) && a.indexOf(val) === i
	}).join('')
	}