JS parsefloat parseint Conversion Function _ basic knowledge

JS parsefloat parseint

JavaScript provides 3 explicit type conversion functions, namely, eval (), parseint (), and parsefloat ().

Eval () Function: Converts a string expression to a numeric value. For example, the result of a statement total=eval ("432.1*10") is that total=4321 assigns a value of 4321 to the total variable.

parseint () Function: Converts a string to an integer. Returns the start of the first character of the string and returns 0 if the character does not begin with an integer. The parseint () function can also convert hexadecimal or decimal digits.

For example: parseint ("123xyz") returns 123, and parseint ("xyz") returns 0.

Parsefloat () function: Similar to the parseint () function, which returns the first floating-point number contained on a string. Returns 0 if the string does not start with a valid floating-point number.

For example: parsefloat ("2.1e4xyz") returns 21000, while parsefloat ("xyz") returns 0.

The Parsefloat function method in JavaScript is to return a floating-point number converted from a string. How to use:

Parsefloat (numstring) where the numstring parameter is a string containing a floating-point number. The Parsefloat function method in JavaScript returns a numeric representation that is equal to the number saved in the numstring. Returns NaN (not a number) if the numstring prefix cannot be interpreted as a float.

Parsefloat ("abc")//Return NaN.
Parsefloat ("1.2ABC")//Return 1.2.