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The parseFloat() function in JavaScript parses a string argument and returns a floating-point number. If the first character cannot be converted to a number, it returns NaN.
Example
console.log(parseFloat("3.14")); // 3.14console.log(parseFloat(" 3.14 ")); // 3.14console.log(parseFloat("314e-2")); // 3.14console.log(parseFloat("0.0314E+2")); // 3.14console.log(parseFloat("3.14some non-digit characters")); // 3.14コピーしました。✕コピーImportant Considerations
Handling Invalid Characters
If parseFloat() encounters an invalid character, it returns the number represented up to that point, ignoring the invalid character and all characters following it.
console.log(parseFloat("FF2")); // NaNコピーしました。✕コピーHandling Infinity
parseFloat() can also parse and return Infinity or -Infinity if the string starts with "Infinity" or "-Infinity" preceded by none or more white spaces.
console.log(parseFloat("Infinity")); // Infinityconsole.log(parseFloat("-Infinity")); // -Infinityコピーしました。✕コピーInteraction with BigInt
parseFloat () - JavaScript | MDN
JavaScript parseFloat () Method - W3Schools
Description The parseFloat() method parses a value as a string and returns the first number.
- value: Required.The value to parse.
JavaScript Number parseFloat () Method - GeeksforGeeks
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