Learn JavaScript
Number Methods
19.3
Lesson

parseInt()

The parseInt() function converts an integer into its string representation. It reads the string and converts it until it gets a character which cannot be converted to a number.

In the example given below, the string stored in the variable myNum contains numbers 123 and the letters px. The function stops reading the string as soon as it gets to the letter p and returns 123 as the result.

When the string has a floating point number, the function ignores the numbers after the decimal point and returns the integer part of the number.

In the example give below, the function ignores 34 that comes after the decimal point.