# Approximately number equality

JavaScript, Math · Nov 1, 2020

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`

.

```
const approximatelyEqual = (v1, v2, epsilon = 0.001) =>
Math.abs(v1 - v2) < epsilon;
```

`approximatelyEqual(Math.PI / 2.0, 1.5708); // true`