console: document the behavior of console.assert()

Add a description and an example of console.assert() call with no arguments. If called like this, the method should output: "Assertion failed". Fixes: #34500 Refs: https://nodejs.org/dist/latest-v14.x/docs/api/console.html#console_console_assert_value_message Refs: https://console.spec.whatwg.org/#assert PR-URL: #34501 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Anto Aravinth <[email protected]> Reviewed-By: Zeyu Yang <[email protected]>
nodejs · Jul 28, 2020 · 4cee226 · 4cee226
1 parent 8598ab8
commit 4cee226
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/doc/api/console.md b/doc/api/console.md
@@ -153,6 +153,7 @@ changes:
 * `...message` {any} All arguments besides `value` are used as error message.
 
 A simple assertion test that verifies whether `value` is truthy. If it is not,
+or `value` is not passed,
 `Assertion failed` is logged. If provided, the error `message` is formatted
 using [`util.format()`][] by passing along all message arguments. The output is
 used as the error message.
@@ -162,6 +163,8 @@ console.assert(true, 'does nothing');
 // OK
 console.assert(false, 'Whoops %s work', 'didn\'t');
 // Assertion failed: Whoops didn't work
+console.assert();
+// Assertion failed
 ```
 
 Calling `console.assert()` with a falsy assertion will only cause the `message`