How to get array of values of attributes from objectarray

Question

i have a problem with the following situation:

I have an Array of Objects which all contains the same attribute, which is called src

Before adding a new Object (with an src attribute too), I want to check if the value already exists in just one src attribute in the Objects Array.

Therefore I wanted to use $.inArray() with the new src as first parameter and as array not the array of objects, but the array of the values of the attributes from the objects array.

As Example:

I have

var arrayOfObjects = [{
    src : "source1",
    otherAttribute : "value"
}, {
    src : "source2",
    otherAttribute : "value"
}];

My question is: Is there a build in function in JavaScript/jQuery which returns

["source1","source2"]

when called with functionX(arrayOfObjects) ?

possible duplicate of How can I convert the "arguments" object to an array in JavaScript? — Stratus3D
– Stratus3D, Commented Jan 8, 2015 at 15:21

raina77ow · Accepted Answer · 2015-01-08 15:14:07Z

2

Well, you can always use Array.prototype.map():

var sources = arrayOfObjects.map(function(obj) {
  return obj.src;
});

... but for your specific case, I'd rather choose a bit different approach - checking against array directly with Array.prototype.some():

function doesSourceExist(source) {
  return arrayOfObjects.some(function(obj) { 
    return obj.src === source; 
  });
}

answered Jan 8, 2015 at 15:14

raina77ow

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1 Comment

Ba5t14n Over a year ago

Thank you very very much! Because I need the index of the element anyway (to focus this element) I used $.inArray now :)

Sukima · Accepted Answer · 2015-01-08 15:17:15Z

0

Not an answer but an addendum to @raina77ow's answer for cleaner code.

function property(prop) {
  return function(obj) {
    return obj[prop];
  };
}

var sources = arrayOfObjects.map(property('src'));

answered Jan 8, 2015 at 15:17

Sukima

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