To concatenate two numbers in javascript add an empty string to the numbers, e.g. `"" + 1 + 2`. When using the addition operator with a string and a number, it concatenates the values and returns the result.

How to Concatenate Two Numbers in JavaScript


## Concatenate Two Numbers in JavaScript

**To concatenate two numbers in javascript add an empty string to the numbers,
e.g. `"" + 1 + 2`. When using the addition operator with a string and a number,
it concatenates the values and returns the result.**

```javascript:index.js
const num1 = 1;
const num2 = 2;

const concat = '' + num1 + num2;
console.log(concat); // 👉️ '12'

console.log(typeof concat); // string
```

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We used the
[Addition (+)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Addition)
operator to concat two numbers.

When used with a number and a string, the operator concatenates them.

```javascript:index.js
console.log(1 + 'hello'); // 👉️ '1hello'
console.log(1 + '10'); // 👉️ '110'
console.log('100' + 200); // 👉️ '100200'
```

<Alert type="error">
  Note that the result has a type of <code>string</code>, if you need the result
  as a number, pass it to the <code>Number</code> object.
</Alert>

```javascript:index.js
const num1 = 1;
const num2 = 2;

const concat = '' + num1 + num2;

console.log(concat); // 👉️ 12
console.log(typeof concat); // string

// 👇️ convert back to number
const num = Number(concat);

console.log(num); // 12
console.log(typeof num); // 👉️ number
```

Also note that the string must be added to the beginning when concatenating two
numbers. If you add it at the end, the numbers would get added and the string
would just convert the result to a string.

```javascript:index.js
// ⛔️ Doesn't work
console.log(1 + 5 + ''); // 👉️ 6

// ✅ Does work
console.log('' + 1 + 5); // 👉️ 15
```

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## Further Reading

- [Convert a Comma Separated String to Array in JavaScript](/blog/javascript-convert-comma-separated-string-to-array)
- [Convert a Negative Number to Positive in JavaScript](/blog/javascript-convert-negative-number-to-positive)

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How to Concatenate Two Numbers in JavaScript

Concatenate Two Numbers in JavaScript #

Further Reading #

Borislav Hadzhiev

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How to Concatenate Two Numbers in JavaScript

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Further Reading #

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Borislav Hadzhiev

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