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Posted On 01.17.2022

The built-in <code>console</code> comes with the <code>console.assert</code> method, which is pretty useful to write some tests in your code.
This method has the syntax of:
<pre><code>console.assert(assertion: bool, msg: string, obj1: any, obj2: any,...)
</code></pre>
When the <code>assertion</code> expression returns <code>false</code>, the execution will be stopped, and the <code>msg</code> string will be printed out after the <code>"Assertion failed:"</code> message. You can format the <code>msg</code> just like how you format strings in languages like C++, using any <code>obj</code> followed after <code>msg</code>.
Otherwise, the execution continues.
For example:
<pre><code>const actual = 10;
const expected = 15;
console.assert(actual === expected, "Expected %d. Got %d", expected, actual);
console.log("All good!);
</code></pre>
Result:
<pre><code>Assertion failed: Expected 15. Got 10
</code></pre>
If we change <code>actual = 15</code>, the output on the screen will be:
<pre><code>All good!
</code></pre>
<hr>

</div></div>

← All posts
Posted On 01.17.2022

The built-in console comes with the console.assert method, which is pretty useful to write some tests in your code.
This method has the syntax of:
console.assert(assertion: bool, msg: string, obj1: any, obj2: any,...)

When the assertion expression returns false, the execution will be stopped, and the msg string will be printed out after the "Assertion failed:" message. You can format the msg just like how you format strings in languages like C++, using any obj followed after msg.
Otherwise, the execution continues.
For example:
const actual = 10;
const expected = 15;
console.assert(actual === expected, "Expected %d. Got %d", expected, actual);
console.log("All good!);

Result:
Assertion failed: Expected 15. Got 10

If we change actual = 15, the output on the screen will be:
All good!





01.17.2022 - JavaScript/Console Assert Command