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javascript/snippets/approximately-equal.md

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+---
+title: Approximate number equality
+type: snippet
+tags: [math]
+cover: engine
+dateModified: 2020-11-01T20:50:57+02:00
+---
+
+Checks if two numbers are approximately equal to each other.
+
+- Use `Math.abs()` to compare the absolute difference of the two values to `epsilon`.
+- Omit the third argument, `epsilon`, to use a default value of `0.001`.
+
+```js
+const approximatelyEqual = (v1, v2, epsilon = 0.001) =>
+  Math.abs(v1 - v2) < epsilon;
+```
+
+```js
+approximatelyEqual(Math.PI / 2.0, 1.5708); // true
+```