### String to Int in javascript

In my previous article, Learned how to do Integer to String convert example. Now we will walk through the**String to Integer convert example**. String and Integer are basic data types in a javascript programming language. The string is a valid object if it enclosed either in

*single quotes*or

*double quotes*where integer represents the number.

- Using parseInt function
- Using Number type

#### Syntax of parseInt() method

**parseInt(string object, radix)**

**parseInt(string object)**

and input parameters are string and radix

**string**:- is the string object to convert

**radix**:- it is the base of the number which is going to return as an integer for the string. default radix value is 10.

output always returns valid number, if the number is not valid, it returns

**NaN**value```
var numbertype=parseInt('51') // valid and returns 51 as number not string
var numbertype=parseInt("50") // valid and returns 50 as number not string
var numbertype=parseInt("abc") // not valid and returns NaN as abc is not formated number
var num = parseInt("20 25 60"); // valid and returns first string separted by space returned ie 20
var num = parseInt("20,25,60"); // valid and returns first string separted by comma returned ie 20
var num = parseInt("152.99"); // valid and returns number from floating number
```

#### radix parameter examples

radix is base value in mathematical expressions. Default value is 10.```
var numbertype=parseInt('751',10) // valid and returns 7*100+5*10+1(751) as number not string
var numbertype=parseInt('15,8) // valid and returns 1*8+5(13) as number not string
```

#### Using Number type

**Number(string object)**

this Number object converts a string object to a number. The number can be an integer and floating numbers

```
var numbertype=Number('51') // valid and returns 51 as number not string
var numbertype=Number("50") // valid and returns 50 as number not string
var numbertype=Number("abc") // not valid and returns NaN as abc is not formated number
```

#### check if the string is a valid integer or not?

isNaN() is used to check whether a string is a valid number or not

```
if (isNaN(Number('123string')) {
// This is a string object
}
else {
// It's a number
}
```

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