assertFalse | /assert/assert_false.ts | std@0.223.0 | Deno

std/assert/assert_false.ts>assertFalse

The Deno Standard Library

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function assertFalse

import { assertFalse } from "https://dotland.deno.dev/std@0.223.0/assert/assert_false.ts";

assertFalse(expr: unknown, msg?): asserts expr is Falsy

Make an assertion, error will be thrown if expr have truthy value.

Examples

Example 1

import { assertFalse } from "https://deno.land/std@0.223.0/assert/assert_false.ts";

assertFalse(false); // Doesn't throw
assertFalse(true); // Throws

Parameters

expr: unknown

optional

msg = [UNSUPPORTED]

Returns

asserts expr is Falsy