Assert module for assertions in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the assert module in Node.js.

Node.js

const assert = require('[1]');

Drag options to blanks, or click blank then click option'

Aassert

Bfs

Chttp

Dpath

Attempts:

3 left

💡 Hint

Common Mistakes

Using other module names like 'fs' or 'http' instead of 'assert'.

Forgetting to put the module name in quotes.

The assert module is built-in in Node.js and is imported using require('assert').

2fill in blank

medium

Complete the code to assert that two values are strictly equal.

Node.js

assert.[1](5, 5);

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AnotEqual

BdeepEqual

CstrictEqual

Dthrows

Attempts:

3 left

💡 Hint

Common Mistakes

Using notEqual which checks for inequality.

Using deepEqual which checks object structure.

assert.strictEqual(a, b) checks that a and b are strictly equal (===).

3fill in blank

hard

Fix the error in the code to assert that a function throws an error.

Node.js

assert.[1](() => { throw new Error('fail'); });

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AdoesNotThrow

Bthrows

Cok

DstrictEqual

Attempts:

3 left

💡 Hint

Common Mistakes

Using doesNotThrow which expects no error.

Using strictEqual which compares values.

assert.throws() checks that the function throws an error as expected.

4fill in blank

hard

Fill both blanks for deep equality and inequality assertions on objects.

Node.js

assert.[1]({a: 1}, {a: 1}); // deep comparison
assert.[2]({a: 1}, {a: 2}); // should pass

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AdeepEqual

BstrictEqual

CnotDeepEqual

Dok

Attempts:

3 left

💡 Hint

Common Mistakes

Using strictEqual for objects which compares references.

Using ok which checks truthiness.

deepEqual checks deep equality of objects, while notDeepEqual asserts they are not deeply equal.

5fill in blank

hard

Fill all three blanks to assert that a value is truthy, not equal to zero, and not strictly equal to 1.

Node.js

assert.[1](value); // check truthy
assert.[2](value, 0); // check not equal
assert.[3](value, 1); // check not strictly equal

Drag options to blanks, or click blank then click option'

Aok

BnotEqual

CnotStrictEqual

Dequal

Attempts:

3 left

💡 Hint

Common Mistakes

Using equal instead of notEqual.

Confusing notEqual and notStrictEqual.

ok asserts truthiness, notEqual asserts inequality, and notStrictEqual asserts strict inequality.