How to convert data from Javascript object to string

Question

I have data that looks like this:

var data = {status: "OK", address11: 0.2, address12: 0.3}

I want this string:

Transfer Successful! You transferred: 0.2 to address11, 0.3 to address12

How do I do this efficiently?

I have this:

var a = 'Transfer Successful! You transferred:'
for (const key of Object.keys(data)) {a.concat(`${data[key]} to ${key}`)}

But it's only appending the last key/value pair.

Possible duplicate of [Converting an object to a string](https://stackoverflow.com/questions/5612787/converting-an-object-to-a-string) — Obsidian Age, Jan 31 '18 at 19:27
You're just missing out the assignment: `a = a.concat("stuff to add");` (or `a += "stuff to add";`). `concat` returns a *new* string, it doesn't (and can't) change the string you call it on. First stop is always a good reference, such as MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat — T.J. Crowder, Jan 31 '18 at 19:28

Mihai Alexandru-Ionut · Answer 1 · 2018-01-31T19:35:18.883

Just use += operator in order to append a string to another.

Also , you have to remove the first key from your object. For this, you can use slice method applied for key's array.

keys = Object.keys(data).slice(1);

Use += for performance because is faster than concat.

MDN has the following to say about string.concat():

It is strongly recommended to use the string concatenation operators (+, +=) instead of this method for perfomance reasons

var data = {status: "OK", address11: 0.2, address12: 0.3}
var a = 'Transfer Successful! You transferred:';
keys = Object.keys(data).slice(1);
for (const key of keys) {a +=` ${data[key]} to ${key}`}
console.log(a);

score 1 · Answer 2 · answered Jan 31 '18 at 19:32

You need to store this a.concat('${data[key]} to ${key}' to your variable a

a = a.concat(`${data[key]} to ${key}`

and avoid the key status

var data = {
  status: "OK",
  address11: 0.2,
  address12: 0.3
}

var a = 'Transfer Successful! You transferred: ';
for (const key of Object.keys(data)) {
  if (key === 'status') continue
  a = a.concat(`${data[key]} to ${key} `)
}

console.log(a)

James · Answer 3 · 2018-01-31T19:45:53.847

I would set up your data object differently, so you don't have to rely on what the property names are in order to know if it's "status" or some transfer address. Storing the transfers in an array also guarantees their order, which may or may not be important.

var data = {
  status: "OK",
  transfers: [{
    to: "address11",
    amount: 0.2
  },{
    to: "address12",
    amount: 0.3
  }]
};


var a = "Transfer Successful! You transferred " + data.transfers.map(t => t.amount + " to " + t.to).join(", ");

console.log(a);

score 0 · Answer 4 · answered Jan 31 '18 at 19:31

0

You can do it with a cycle:

var txt = 'Transfer Successful! You transferred';
var first = true;
for (var key in data) {
    if (key !== "status") {
        first ? (first = false) : (txt += ", ");
        txt += data[key] + " " + key;
    }
}

answered Jan 31 '18 at 19:31

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How to convert data from Javascript object to string

4 Answers4