Check if an array item is set in JS

Question

I\'ve got an array

    var assoc_pagine = new Array();
    assoc_pagine[\"home\"]=0;
    assoc_pagine[\"about\"]=1;
    assoc_pagine[\"work\"]=2;

Answer 1

function isset(key){
ret = false;
array_example.forEach(function(entry) {
  if( entry == key ){
    ret = true;
  }
});
return ret;
}

alert( isset("key_search") );