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parseFloat(value):

Converts a given value to a float number, if not possible to convert then returns NaN value

Ex:

If the given value is of integer type, then it converts and returns an equivalent float number.

document.write( parseFloat(24) ); // 24

document.write(parseFloat(12+12)); // 24

If the given value is of float type, then it returns the float number as it is.

document.write(parseFloat(3.142)); // 3.142

document.write(parseFloat(1.6+1.6)); // 3.2

If the given value is of string type, then it tries to extract and return the beginning float part.

If string passed to the parseFloat function does not begin with float number then it returns NaN value

document.write(parseFloat(“24”)); // 24

document.write(parseFloat(“3.142”)); // 3.142

document.write(parseFloat(“.142”)); // 0.142

document.write(parseFloat(“3.142.142”)); // 3.142

document.write(parseFloat(“3.142+3.142”)); // 3.142

document.write(parseFloat(“24sometext”)); // 24

document.write(parseFloat(“3.142sometext”)); // 3.142

document.write(parseFloat(“sometext3.142”)); // NaN

document.write(parseFloat (“2”+”4”)); // 24

document.write(parseFloat (“2”+”4.8”)); // 24.8

document.write(parseFloat (“2+4.8”)); // 2

document.write(parseFloat (“2”+”4.8a”)); // 24.8

document.write(parseFloat(“2a”+”4a”)); // 2

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