CODEWITHSUNDEEP
javascriptvuejs2
LDUBBS
LDUBBS

Reputation: 603

How can I get an array of certain key-values?

var obj = [
  {
    "amount": " 12185",
    "job": "GAPA",
    "month": "JANUARY",
    "year": "2010"
  },
  {
    "amount": "147421",
    "job": "GAPA",
    "month": "MAY",
    "year": "2010"
  },
  {
    "amount": "2347",
    "job": "GAPA",
    "month": "AUGUST",
    "year": "2010"
  }
]

How can i get all amounts, that is '12185', '147421', '2347'. I've tried to do this

Object.keys(obj).map(key => obj[key])

Upvotes: 0

Views: 54

Answers (3)

WFarrow47
WFarrow47

Reputation: 31

Your obj variable is actually an array. (denoted by the braces [])

You can use the map function on an array to return what you're asking for.

var amounts = obj.map(x => x.amount); // Array(3) [ " 12185", "147421", "2347" ]

You may also want to append .trim() to the end of x.amount to remove any spaces specifically.

var amounts = obj.map(x => x.amount.trim()); // Array(3) [ "12185", "147421", "2347" ]

var obj = [
  {
    "amount": " 12185",
    "job": "GAPA",
    "month": "JANUARY",
    "year": "2010"
  },
  {
    "amount": "147421",
    "job": "GAPA",
    "month": "MAY",
    "year": "2010"
  },
  {
    "amount": "2347",
    "job": "GAPA",
    "month": "AUGUST",
    "year": "2010"
  }
];


var amounts = obj.map(x => x.amount);

console.log(keys); // Array(3) [ " 12185", "147421", "2347" ]

Upvotes: 2

Gray Hat
Gray Hat

Reputation: 368

I believe you're looking for this

var obj = [
  {
    "amount": " 12185",
    "job": "GAPA",
    "month": "JANUARY",
    "year": "2010"
  },
  {
    "amount": "147421",
    "job": "GAPA",
    "month": "MAY",
    "year": "2010"
  },
  {
    "amount": "2347",
    "job": "GAPA",
    "month": "AUGUST",
    "year": "2010"
  }
];

let amounts = obj.map(v => v.amount);
console.log(amounts);

Upvotes: 1

lux
lux

Reputation: 8455

Your obj is an array, you'll need:

const vals = obj.map(entry => entry.amount); // ["12185", "147421", "2347"]

Upvotes: 1

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