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Showing content from https://webplatform.github.io/docs/javascript/parseInt below:

parseInt · WebPlatform Docs

parseInt Summary

Converts a string to an integer.

Syntax

parseInt( numString , [ radix ])

numString: Required. A string to convert into a number.
radix: Optional. A value between 2 and 36 that specifies the base of the number in numString. If this argument is not supplied, strings with a prefix of ‘0x’ are considered hexadecimal. All other strings are considered decimal.

Examples

parseInt("123.45");  
parseInt("abc");  
parseInt("12abc");

Remarks

The parseInt function returns an integer value equal to the number contained in numString. If no prefix of numString can be successfully parsed into an integer, NaN (not a number) is returned.

You can test for NaN using the isNaN function.