Check if name exists in object array

Question

I have an object array that looks just about like this

 var o = [
   {
    module : "mod1",
    customUrl : [
        { "state"    : "name1",
          "options"  : ["option1", "option2", "option3"]
        },
        { "state"    : "name2",
          "options"  : ["option1", "option2", "option3"]
        }
    ]
  },
 {
    module : "mod2",
    customUrl : [
        { "state"    : "name1",
          "options"  : ["option1", "option2", "option3"]
        },
        { "state"    : "name2",
          "options"  : ["option1", "option2", "option3"]
        }
    ]
 }
]

and in a function I a passed a string. I want to be able to check that string against the "module" keys and see if it matches any of them so like

 checkName = function(name) {
      //check if "name" matches any "module" in o

 }

Is this possible (I am using underscore but normal javascript is fine too).Thanks!

Oleksandr T. · Accepted Answer · 2015-03-04 20:37:20Z

2

You can use function some, like so

var checkName = function(name) {
  return _.some(o, function (el) {
    return el.module === name;
  });
};

or some from Array

var checkName = function(name) {
  return o.some(function (el) {
    return el.module === name;
  });
};

Example

answered Mar 4, 2015 at 20:37

Oleksandr T.

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Comments

kasper Taeymans · Accepted Answer · 2015-03-04 20:46:13Z

1

Pure Javascript solution. This function returns false if the module name is not found or the position in the array when the name is found. This function does not count in duplicates, it only will give the position from the last match.

JSfiddle demo

var checkName = function(name) {
    var flag=false;
    for(var i=0; i<o.length;i++){
        if(name === o[i].module){
            flag=i;
        }
    }return flag;
};
console.log(checkName("mod2"));

answered Mar 4, 2015 at 20:46

kasper Taeymans

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Comments

dsuess · Accepted Answer · 2015-03-04 20:50:36Z

1

Quite another way to do so wiit pure, native JavaScript: convert the object to string and check for exact module-part.

var checkName = function(haystack, needle) {
  return JSON.stringify(haystack).contains('"module":"' + needle + '"')
}

checkName(o, 'mod1'); // returns true
checkName(o, 'mod4'); // returns false

answered Mar 4, 2015 at 20:50

dsuess

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