Extract key values from one Array object and filter from other objects with the extracted values with underscore javascript

Question

var myArray = [{
    "name": "John Doe",
    "age": 29
}, {
    "name": "Anna Smith",
    "age": 24
}];

var myAnotherArray = [{
    "name": "John Doe",
    "age": 29
}, {
    "name": "Anna Smith",
    "age": 24
}, {
    "name": "Peter Jones",
    "age": 39
}, {
    "name": "Gabby",
    "age": 24
}, {
    "name": "Julian",
    "age": 29
}, {
    "name": "George",
    "age": 39
}];

I want to extact all age values from first array and then filter extracted values of age from second array.

Tushar · Accepted Answer · 2015-09-07 03:48:03Z

1

You can use pluck to get the array of all the age from myArray. And then you can use filter, to filter the another array based on the age.

Demo

var myArray = [{
  "name": "John Doe",
  "age": 29
}, {
  "name": "Anna Smith",
  "age": 24
}];


var myAnotherArray = [{
  "name": "John Doe",
  "age": 29
}, {
  "name": "Anna Smith",
  "age": 24
}, {
  "name": "Peter Jones",
  "age": 39
}, {
  "name": "Gabby",
  "age": 24
}, {
  "name": "Julian",
  "age": 29
}, {
  "name": "George",
  "age": 39
}];

var ages = _.pluck(myArray, 'age');

var filtered = _.filter(myAnotherArray, function(i, l) {
  return _.contains(ages, i.age);
});
console.log(filtered);
document.write(JSON.stringify(filtered));

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

edited Sep 7, 2015 at 3:48

answered Sep 4, 2015 at 3:57

Tushar

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