comparing two javascript arrays?

Question

I want to compare two arrays with each other and see if there is a match, and if there is do something.

var answers = new Array(\"a\",\"b\",\"c\",\"d\", \"e\");
         


        

Answer 1

Try this code:

var a = [1,2,3,4]
  , b = [1,3,5,7,9]
  , c = ['a','b','c'];

function findDups( arr1, arr2 ) {
  var arrs = [ arr1, arr2 ].sort(function( a,b ) {
    return a.length > b.length;
  });
  return arrs[0].filter(function( v ) {
    return ~arrs[1].indexOf( v ); 
  });
}

function hasDups( arr1, arr2 ) {
  return !!findDups( arr1, arr2 ).length;
}

console.log( findDups( a,b ) ); //=> [1, 3]
console.log( hasDups( a,c ) ); //=> false