Module

std/testing/asserts.ts

Deno standard library
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function assertAlmostEquals
import { assertAlmostEquals } from "https://deno.land/std@0.151.0/testing/asserts.ts";

Make an assertion that actual and expected are almost equal numbers through a given tolerance. It can be used to take into account IEEE-754 double-precision floating-point representation limitations. If the values are not almost equal then throw.

import { assertAlmostEquals, assertThrows } from "./asserts.ts";

assertAlmostEquals(0.1, 0.2);

// Using a custom tolerance value
assertAlmostEquals(0.1 + 0.2, 0.3, 1e-16);
assertThrows(() => assertAlmostEquals(0.1 + 0.2, 0.3, 1e-17));

Parameters

actual: number
expected: number
optional
tolerance = [UNSUPPORTED]
optional
msg: string