Filter an array of object by object content

Question

I am trying to filter an array of objects by its content, i.e.:

var arr =[
    {
    "uid": "1",
    "name": "John Doe"
  },
  {
    "uid": "2",
    "name": "Kate Roe"
  }
];

var newArr = arr.filter(function(e) {
    return e["uid"] == 1;
});

alert(newArr["name"]);

I wanted to create a new array that contains only one object which uid is equal to 1. However, it gives me undefined. What am I doing wrong?

Two problems: your `.filter()` callback uses `=` instead of `==` (`=` is for assignment), and the `alert()` call should be `alert(newArr[0].name)` or `alert(newArr[0]["name"])` (either would work). — Pointy, Apr 17 '16 at 16:24
Although = was a misspelling, the second point is what I was looking for! Thanks! — sdvnksv, Apr 17 '16 at 16:28

isvforall · Accepted Answer · 2016-04-17T16:36:04.140

3

Here you assign the value:

return e["uid"] = 1;

Use double equals == to check the value for equality:

return e["uid"] == 1;

Note that filter() returns array, not object. Use brackets notation [0] to get first element from an array.

See working snippet below

var arr = [{
    "uid": "1",
    "name": "John Doe"
}, {
    "uid": "2",
    "name": "Kate Roe"
}];

var newArr = arr.filter(function(e) {
    return e["uid"] == 1;
});

alert(newArr[0]["name"]);

edited Apr 17 '16 at 16:36

answered Apr 17 '16 at 16:24

isvforall

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1

Also should note that `filter()` returns array , not object – charlietfl Apr 17 '16 at 16:26

score 1 · Answer 2 · edited Apr 17 '16 at 18:25

1

Using Lodash

_.filter(array, { uid: 1 });

edited Apr 17 '16 at 18:25

GG.

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answered Apr 17 '16 at 18:23

Devank

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Filter an array of object by object content

2 Answers2