JavaScript has a singular numeric data type, which can be expressed with or without decimal points.
Example
| let x = 3.14; // A number with decimals let y = 3; // A number without decimals |
Very large or very small numbers can be represented using scientific (exponential) notation in JavaScript.
Example
| let x = 123e5; // 12300000 let y = 123e-5; // 0.00123 |
Unlike many languages, JavaScript doesn’t distinguish between number types like integers or floats. All numbers are stored as 64-bit double-precision floating-point values, following the IEEE 754 standard, with 52 bits for the fraction, 11 for the exponent, and 1 for the sign.
|
Value (aka Fraction/Mantissa) |
Exponent |
Sign |
|
52 bits (0 – 51) |
11 bits (52 – 62) |
1 bit (63) |