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

This is not an Array. Better declare it like this:

var assoc_pagine = {};
assoc_pagine["home"]=0;
assoc_pagine["about"]=1;
assoc_pagine["work"]=2;

or

var assoc_pagine = {
                 home:0,
                 about:1,
                 work:2
               };

To check if an object contains some label you simply do something like this:

if('work' in assoc_pagine){
   // do your thing
};