Overview of Math in JavaScriptOverview of Math in JavaScriptJavaScript understands octal, hexadecimal and decimal integers. In addition to integers such as 27 or 89, which JavaScript interprets in base-10, you may use base-eight (octal) and base-16 (hexadecimal) numbers in your scripts by using the prefixes "0" and "0x". For example, the number 16 equates to 020 in octal and 0x10 in hexadecimal. Valid integers include:
Floating points are comprised of several optional parts. Floating point numbers start with an decimal integer followed by a decimal point, a fraction and an exponent. Exponents are marked with "e" or "E" and followed by an integer. Valid floating point numbers include:98 0xffff 0377
A special number, NaN, handles error conditions. These conditions include dividing by zero or trying to evaluate a nonnumeric text string such as "f23". You can usually treat this "Not a Number" as a zero.2.7 -2.7E15 .2e-5 2E2
Type some numbers and press the evaluate button to see how JavaScript evaluates your numbers. This script uses the built-in functions parseInt() and parseFloat().
| + | addition | - | subtraction |
| * | multiplication | / | division |
| % | modulus | ++ | increment |
| -- | decrement | - | unary negation |
| & | bitwise AND | | | bitwise OR |
| ^ | bitwise XOR | << | left shift |
| >> | right shift | >>> | zerofill right shift |
| Category | Function | Example |
| Scale | Maximum | Math.max(5,99) |
| Minimum | Math.min(5,99) | |
| Abs. Value | Math.abs(-151.15) | |
| Rounding | Round | Math.round(1.15) |
| Ceiling | Math.ceil(1.15) | |
| Floor | Math.floor(1.15) | |
| Trig | Sine | Math.sin(3.14159) |
| Cosine | Math.cos(3.14159) | |
| Tangent | Math.tan(0) | |
| Arcsine | Math.asin(-1) | |
| Arccosine | Math.acos(-1) | |
| Arctan | Math.atan(0) | |
| Exponentiation | 2^Exponent | Math.exp(1) |
| Natural Log | Math.log(2.7) | |
| Power a^b | Math.pow(5,2) | |
| Roots | Square Root | Math.sqrt(100) |
Type a JavaScript expression in the field below. Press the evaluate button to see how JavaScript evaluates your numbers. Try, for example, Math.sqrt(49). Make sure to keep track of upper- and lowercase in your expressions.