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

parseFloat · WebPlatform Docs

Converts a string to a floating-point number.

parseFloat( numString )

parseFloat("123.45")  
parseFloat("abc")  
parseFloat("1.2abc")  

The required numString argument is a string that contains a floating-point number.

The parseFloat function returns a numerical value equal to the number contained in numString. If no prefix of numString can be successfully parsed into a floating-point number, NaN (not a number) is returned.

You can test for NaN using the isNaN function.

• isNaN Function
• parseInt Function
• String Object

• Microsoft Developer Network: Article

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