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## How To Convert String To Number in Javascript ?

Last Updated on Wednesday 5th Oct 2022

## Javascript Convert string to number

• You've got a string, and it contains a number. Maybe it's coming from API or some data that you've imported.
```			```
const number = '1234';
console.log(number + 1); // 12341

```

```
• If you add a number, it just appends items onto the end of the string rather than adding them to the actual Number.

• So, we want to convert this string that contains a number into an actual number.

### Syntax

```			```

```

```
• string - The value to be parsed. If the parameter is not a string, it is converted to a string.
• radix (optional) From 2 to 36, radix string. For example, specifying 16 means that the parsed value is a hexadecimal number.
```			```
const number = '1234';
console.log(parseInt(number) + 1); // 1235

```

```

## Using Number Function

### Syntax

```			```
Number(object)

```

```
• The `Number()` function converts the object argument to a number that represents the object's value.
```			```
const number = '1234';
console.log(Number()); // 0
console.log(Number(number)); // 1234

```

```
• If you do Not Pass anything, it returns 0.

## Using Unary Operator (+)

• Unary operators can be beneficial for converting strings to numbers, and they offer the fastest, most straightforward way to convert.
```			```
const number = '1234';
const un = +number;
console.log(number, typeof number); // 1234 string
console.log(un, typeof un); // 1234 number

```

```

## Using Multiply with Number

• Multiplying the string with `1` does not change the value and will also be converted to a number.
```			```
const number = '5678';
const mul = number * 1;
console.log(number, typeof number); // 5678 string
console.log(mul, typeof mul); // 5678 number

```

```

## Using double NOT bitWise operator ( double tilde operator ~~ )

• It is used as a faster substitute for `Math.floor()` for positive numbers.
• The double tilde operator is not as much an operator as it's a double NOT bitwise operator / double bitwise negation.
```			```
const number = '1234567';
const negNumber = '-1234567';
const dou = ~~number;
const dou1 = ~~negNumber;
console.log(number, typeof number); // 1234567 string
console.log(dou, typeof dou); // 1234567 number
console.log(dou1, typeof dou1); // -1234567 number

```

```

## Using Math.floor()

• This method returns the largest integer (floor value) that is less than or equal to the parameter value
```			```
const number = '1234567';
const flo = Math.floor(number);
console.log(flo, typeof flo); // 1234567 number

```

```
• It is a Little tricky with decimal numbers since it will return the value of the nearest integer as Number.
```			```
const number = '13.33';
const flo = Math.floor(number);
console.log(flo, typeof flo); // 13 number

```

```
```			```
const number = '13.63';
const flo = Math.floor(number);
console.log(flo, typeof flo); //13

```

```