Javascript object array to string

Question

Assuming I have an object array:

array=[
  {
    "Item": "A"
    "Quantity" : 2
  },
  {
    "Item": "B"
    "Quantity" : 7
  },
  {
    "Item": "C"
    "Quantity" : 1
  }
]

I am wondering what would be my options to get the following string output :

(A, 2), (B, 7), (C,1)

adiga · Accepted Answer · 2019-03-14 12:25:03Z

4

You could map the Object.values and join like this:

Loop through the array using map
Object.values(a) returns an array like this: ["A", 2]
join them using and wrap a () around using template literals
join the resulting string array from map using another join

const array = [
  {
    "Item": "A",
    "Quantity" : 2
  },
  {
    "Item": "B",
    "Quantity" : 7
  },
  {
    "Item": "C",
    "Quantity" : 1
  }
]

const str = array.map(a => `(${ Object.values(a).join(", ") })`)
                 .join(", ")
                 
console.log(str)

If you're okay with (A,2), (B,7), (C,1) without a space in between them, you could simply use

const array=[{"Item":"A","Quantity":2},{"Item":"B","Quantity":7},{"Item":"C","Quantity":1}]

const str = array.map(a => `(${ Object.values(a) })`).join(", ")
console.log(str)

edited Mar 14, 2019 at 12:25

answered Mar 14, 2019 at 12:14

adiga

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2 Comments

Nina Scholz Over a year ago

you need ordered objects and not more properties for this approach.

adiga Over a year ago

@NinaScholz You're right. I'm assuming OP has provided MCVE and created the objects in the way it's mentioned in the question :)

obscure · Accepted Answer · 2019-03-14 12:07:49Z

3

This is not the most elegant way to do this but it's easy to understand:

array = [{
    "Item": "A",
    "Quantity": 2
  },
  {
    "Item": "B",
    "Quantity": 7
  },
  {
    "Item": "C",
    "Quantity": 1
  }
];

var str = "";
for (var a = 0; a < array.length; a++) {
  str += "(";
  str += array[a].Item + ",";
  str += array[a].Quantity + ")";
  if (a != array.length - 1) {
    str += ",";
  }
}
console.log(str);

answered Mar 14, 2019 at 12:07

obscure

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Comments

Nina Scholz · Accepted Answer · 2019-03-14 12:08:13Z

1

You could map the values and join them.

var array = [{ Item: "A", Quantity: 2 }, { Item: "B", Quantity: 7 }, { Item: "C", Quantity: 1 }],
    string = array
        .map(({ Item, Quantity }) => `(${[Item, Quantity].join(', ')})`)
        .join(', ');
    
console.log(string);

answered Mar 14, 2019 at 12:08

Nina Scholz

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Comments

Hien Nguyen · Accepted Answer · 2019-03-14 12:10:06Z

1

You can use

array.map(function(item){ return "(" + item.Item + "," + item.Quantity + ")"}).join(",");

var array=[
  {
    "Item": "A",
    "Quantity" : 2
  },
  {
    "Item": "B",
    "Quantity" : 7
  },
  {
    "Item": "C",
    "Quantity" : 1
  }
];
var result = array.map(function(item){ return "(" + item.Item + "," + item.Quantity + ")"}).join(",");
console.log(result);

answered Mar 14, 2019 at 12:10

Hien Nguyen

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