std::modf() is a function in the C++

https://docs.vultr.com/javascript/global/parseFloat

parseFloat() is a JavaScript function that converts a string into a floating-point (decimal) number.

Syntax:
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parseFloat(string);
string → The value to convert.
Returns: A floating-point number or NaN if conversion fails.
Example 1: Basic Usage
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console.log(parseFloat(“10.5”)); // Output: 10.5
console.log(parseFloat(“3.14abc”)); // Output: 3.14 (stops at first non-numeric)
console.log(parseFloat(“abc3.14”)); // Output: NaN (not a number)