Underscorejs - Compare two arrays with objects

Question

I want to compare two arrays with objects with different key names using underscore...

array1 = [{email:"[email protected]", first_name:"asad"}, {email:"[email protected]", first_name:"name1"}]

array2 = [{email2:"[email protected]", first_name2:"asad"}, {email2:"[email protected]", first_name2:"name22"}]

Want Output of unique email IDS from array2 which is NOT present in array1 like this...

array3 = [{email2:"[email protected]", first_name2:"name22"}]

Duncan · Accepted Answer · 2017-01-17 09:26:06Z

2

Convert array1 to an object with the email addresses as keys, then filter array2 based on that:

var t = {};
angular.forEach(array1, function(v) { t[v.email] = 1 });
var array3 = array2.filter(
    function (v) {
       return angular.isUndefined(t[v.email2]);
    });

Sorry, underscorejs not needed here.

Or if you can use modern JS syntax it reads a bit more cleanly:

var t = {};
array1.forEach(v => t[v.email] = 1);
var array3 = array2.filter(v => angular.isUndefined(t[v.email2]));

edited Jan 17, 2017 at 9:26

answered Jan 17, 2017 at 9:20

Duncan

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