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In JavaScript, I have a number which is 21 digits, and I want to parse it.
Does a parseDouble method exist in JavaScript?
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parseDouble() method is available in java. lang package. parseDouble() method is used to return the double value corresponding to the given String or in other words we can say this method is used to convert a string value to double value.
isInteger() In the above program, the passed value is checked if it is an integer value or a float value. The typeof operator is used to check the data type of the passed value. The isNaN() method checks if the passed value is a number.
JavaScript numbers are always stored as double precision floating point numbers, following the international IEEE 754 standard. This format stores numbers in 64 bits, where the number (the fraction) is stored in bits 0 to 51, the exponent in bits 52 to 62, and the sign in bit 63: Value (aka Fraction/Mantissa)
The Number is a primitive data type used for positive or negative integer, float, binary, octal, hexadecimal, and exponential values in JavaScript. The Number type in JavaScript is double-precision 64 bit binary format like double in C# and Java.
It's not possible to natively deal with a 21-digit precision number in JavaScript.
JavaScript only has one kind of number: "number", which is a IEEE-754 Double Precision ("double") value. As such, parseFloat in JavaScript is the equivalent of a "parse double" in other languages.
However, a number/"double" only provides 16 significant digits (decimal) of precision and so reading in a number with 21-digits will lose the 5 least significant digits1.
For more precision (or accuracy) a "big number" library must be used;
1 Information can be lost when encoding as an IEEE "double", which cannot encode all decimal values exactly, but that's another question..
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