Question

I have a two level JSON object

EX:

var regexDefs = {

  "alpha": {
    "regex": /^[A-Z]+$/,
    "errMsg": "Alpha Only"
  }
}

I want to do something akin to searching an array for a key.

(using jQuery’s inArray)

var key = "alpha";
alert($.inArray(key,regexDefs));

if the key is in the array then I want to do

if(regexDefs[key].regex.test){ return true; }

I know there may be something funky I’m missing because this is an object not an Array…

doing

$.inArray(key,regexDefs)

returns undefined

=/

Any thoughts?

Answer 1

The most accurate way is

if ("alpha" in regexDefs)
{
}

This would evaluate true even if alpha was a falsey value such as 0, null, NaN, false, etc.

You can do the same with a variable:

var key = "alpha";
if (key in regexDefs)
{
}