Compare only one value from array of objects Javascript(No Sorting)

Question

Is there an optimal way to compare a property value from two array of objects using lodash/underscorejs?

I have an array like this.

var a = [{'text':1}, {'text':2, 'misc':22}, {'text':3}];
var b = [{'text':1}, {'text':2}, {'text':3}];

comparing a and b should return true based on the property 'text'.

Have tried using _.isEqual and _.isMatch with not much help.

Here is the JSFIDDLE

pawel · Accepted Answer · 2015-01-27 21:45:48Z

4

You can use pluck _.pluck( list, key) to get the values of key in a list of objects in list, so get the values of text and compare

_.isEqual(_.pluck(a, "text"),_.pluck(b, "text"));

http://jsfiddle.net/mhqpe06h/1/

answered Jan 27, 2015 at 21:45

pawel

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1 Comment

SomeUiDev Over a year ago

Thank you, it was quick and easy. Accepting this as answer, as I was looking for underscorejs based.

Felix Kling · Accepted Answer · 2015-01-27 21:45:04Z

1

This is pretty easy without any library, although libraries provide alternative implementations for Array#every:

var same = a.length === b.length && a.every(function(value, index) {
    return value.text === b[index].text;
});

answered Jan 27, 2015 at 21:45

Felix Kling

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2 Comments

Daniel Weiner Over a year ago

This assumes that both arrays are sorted

Felix Kling Over a year ago

Of course, I assume the array is used as a list, so the order is important. For me [a, b] is certainly different from [b, a]. If that's not what the OP wants, they should clarify their question.

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