Is there a function to test if objects match other objects?

Question

I have an object like this but more complex:

var obj = 
{
  a: foo,
  b: bar,
  sub:{
    a: foz
    }
}

and then I have a conditionals based on the keys and values, for example:

{
  a: ^f,
  sub:{
     a: z$
  }
}

Is there a method for checking the conditionals are true for all of the objects properties. I'm also fine with chome-only-features or something like underscore. I can also re-structure the structure of my conditionals.

No, there is no *built-in* method in browsers or underscore that does this. You will have to loop over the object and do this yourself. underscore can probably help you with the looping, but you will still have to do the comparison yourself. — gen_Eric, Dec 26 '14 at 16:27
Your "conditionals" doesn't have a test for `b`. Would that mean it passes or fails? — gen_Eric, Dec 26 '14 at 16:28
You can use something like [chai](http://chaijs.com/api/assert/) *deepEqual* if you are testing . — Mritunjay, Dec 26 '14 at 16:28

agershun · Accepted Answer · 2014-12-28T02:13:56.657

2

Probably you can use deepEqual() or modify it to your needs

var deepTest = function (x, y) {
  if ((typeof x == "object" && x != null) && (typeof y == "object" && y != null)) {
    if (Object.keys(x).length != Object.keys(y).length)
      return false;

    for (var prop in x) {
      if (y.hasOwnProperty(prop))
      {  
        if (! deepEqual(x[prop], y[prop]))
          return false;
      }
      else
        return false;
    }

    return true;
  }
  else if(x && (typeof y != "undefined")) return true; else return false;
}

document.write(deepEqual({a:{b:true}},{a:{c:1}}),'<br>');
document.write(deepEqual({a:{b:true}},{a:{b:1}}),'<br>');
document.write(deepEqual({a:{b:false}},{a:{c:1}}),'<br>');
document.write(deepEqual({a:{b:false}},{a:{b:1}}),'<br>');
document.write(deepEqual(true,true),'<br>');
document.write(deepEqual(true,false),'<br>');
document.write(deepEqual(false,false),'<br>');
document.write(deepEqual(false,false),'<br>');
document.write(deepEqual([true],[1]),'<br>');
document.write(deepEqual([true],[]),'<br>');
document.write(deepEqual([true],[]),'<br>');
document.write(deepEqual([true,true],[]),'<br>');
document.write(deepEqual([true,true],[1,2]),'<br>');

edited Dec 28 '14 at 02:13

answered Dec 26 '14 at 16:32

agershun

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Although, that's a nice start, it doesn't really solve the TO's problem, since he wants more complex "equals". – Thomas Junk Dec 26 '14 at 16:34
He's not looking for "equals" -- he's looking for pattern matching. – Barmar Dec 26 '14 at 16:34
I feel that the statement if (x != y) should be rewritten as if(x && (typeof y != "undefined")) return true; else return false; ? – agershun Dec 26 '14 at 16:35
I modified the answer. Is this what is required? – agershun Dec 26 '14 at 16:38
@Barmar I used quotes to signal that. – Thomas Junk Dec 26 '14 at 16:38
Now it no longer compares equality of `x` and `y` as scalars. Would not downvote this, but wondering why it was accepted since it does not answer the question. – Dec 26 '14 at 18:31
Could you write an example of test for the function? I added some other examples at the code, what is wrong? – agershun Dec 26 '14 at 19:06

Is there a function to test if objects match other objects?

1 Answers1