Quick Reference
The Math.atan2() method returns the arctangent of the quotient of its arguments, as a numeric value between PI and -PI radians.
The number returned represents the counterclockwise angle in radians (not degrees) between the positive X axis and the point (x, y).
- Returns NaN if the parameter is empty or not numeric
<!-- html element to place output -->
<p id="my_output"></p>// variable
let my_math = Math.atan2(4, 3);
// output to the HTML element
document.getElementById('my_output').innerHTML = my_math;Output
0.9272952180016122Syntax
Math.atan2(y, x)Parameters
| Parameter | Description |
|---|---|
| y | The y coordinate (required) |
| x | The x coordinate (required) |
JavaScript Notes:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.