JavaScript Number parseInt() Method
JavaScript parseInt() Method is used to accept the string and radix parameter and convert it into an integer. The radix parameter is used to specify which numeral system to use, for example, a radix of 16 (hexadecimal) indicates that the number in the string should be parsed from a hexadecimal number to a decimal number. If the string does not contain a numeric value then it returns NaN i.e., not a number.
Note: This method is deprecated.
Syntax:
parseInt(Value, radix);
Parameters:
- Value: This parameter contains a string that is converted to an integer.
- radix: This parameter represents the radix or base to be used and it is optional.
Return value:
It returns a number and if the first character can’t be converted to a number then the function returns NaN. It returns a number parsed up to that point where it encounters a character that is not a number in the specified radix(base).
Example 1: In this example, we are using the parseInt() method to parse the given float value.
javascript
let v1 = parseInt("3.14");console.log('Using parseInt("3.14") = '+ v1); |
Using parseInt("3.14") = 3
Example 2: In this example, we are using the parseInt() method to parse the given values.
javascript
a = parseInt("100");console.log('parseInt("100") = ' + a);// It returns a Integer until// it encounters Not a Number characterb = parseInt("2018@geeksforgeeks");console.log('parseInt("2018@geeksforgeeks") = ' + b);// It returns NaN on Non numeral characterc = parseInt("geeksforgeeks@2018");console.log('parseInt("geeksforgeeks@2018") = ' + c);// It returns Integer value of a Floating point Numberd = parseInt("3.14");console.log('parseInt("3.14") = ' + d);// It returns only first Number it encounterse = parseInt("21 7 2018");console.log('parseInt("21 7 2018") = ' + e); |
parseInt("100") = 100
parseInt("2018@geeksforgeeks") = 2018
parseInt("geeksforgeeks@2018") = NaN
parseInt("3.14") = 3
parseInt("21 7 2018") = 21
Example 3: In this example, we will also mention radix with the number.
javascript
// Base 10a = parseInt("100", 10);console.log('parseInt("100",10) = ' + a);// Base 8b = parseInt("8", 8);console.log('parseInt("8",8) = ' + b);// Base 8c = parseInt("15", 8);console.log('parseInt("15",8) = ' + c);// Base 16d = parseInt("16", 16);console.log('parseInt("16",16) = ' + d);// Leading and trailing spaces are ignored// in parseInt() functione = parseInt(" 100 ");console.log('parseInt(" 100 ") = ' + e);// Base 16(hexadecimal)f = parseInt("0x16");console.log('parseInt("0x16") = ' + f); |
parseInt("100",10) = 100
parseInt("8",8) = NaN
parseInt("15",8) = 13
parseInt("16",16) = 22
parseInt(" 100 ") = 100
parseInt("0x16") = 22
Supported Browsers
- Google Chrome 1 and above
- Edge 12 and above
- Firefox 1 and above
- Safari 1 and above
- Opera 3 and above
We have a complete list of JavaScript Number constructor, properties, and methods list, to know more about the numbers please go through that article.
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