1 - Optimizing Parameter Checks
❌ Stop this:
1if (userRole !== 'admin' && userRole !== 'moderator' && userRole !== 'user') {
2 console.error("Invalid user role")
3}
✅ Use instead:
1const allowedRoles = ['admin', 'moderator', 'user'];
2
3if (!allowedRoles.includes(userRole)) {
4 console.error('Invalid user role');
5}
2 - useReducer for toggle states
❌ Stop this:
1const [isModalVisible, setIsModalVisible] = useState(false)
2
3setIsModalVisible((prevState) => !prevState)
✅ Use instead:
1const [isModalVisible, toggleModalVisibility] = useReducer((currentValue) => !currentValue, false)
2
3toggleModalVisibility()
3 - Destructured Objects as Parameters
❌ Stop this:
1const processUserData = (firstName, lastName, age, email) => {
2 ....
3}
4
5processUserData("Toto", "Tata", 35, "tototata@gmail.com");
✅ Use instead:
1const processUserData = ({ firstName, lastName, age, email }) => {
2 ....
3}
4
5processUserData({
6 firstName: "Toto",
7 lastName: "Tata",
8 age: 35,
9 email: "tototata@gmail.com"
10});
4 - Efficient Object Cloning
❌ Stop this:
1const originalObject = {
2 key1: 'value1',
3 key2: {
4 key2a: () => console.log('value2a')
5 }
6}
7
8const objectCopy = originalObject
✅ Use instead:
1const originalObject = {
2 key1: 'value1',
3 key2: {
4 key2a: () => console.log('value2a')
5 }
6}
7
8const objectCopy = structuredClone(originalObject)
9// or
10const objectCopy = {...originalObject}
5 - Use Set to efficiently manage unique values
❌ Stop this:
1const uniqueItemsArray = ['Apple', 'Banana', 'Orange', 'Banana', 'Apple'];
2
3// Adding new items to the Array
4uniqueItemsArray.push('Grapes');
5uniqueItemsArray.push('Orange'); // Already exists but added again
6
7// Checking if a value exists in the Array
8const hasGrapes = uniqueItemsArray.includes('Grapes');
9
10// Deleting an item from the Array
11uniqueItemsArray = uniqueItemsArray.filter(item => item !== 'Banana');
12
13uniqueItemsArray.forEach(item => {
14 console.log(item);
15});
✅ Use instead:
1const uniqueItemsSet = new Set(['Apple', 'Banana', 'Orange', 'Banana', 'Apple']);
2// will show ['Apple', 'Banana', 'Orange']
3
4// Adding new unique items to the Set
5uniqueItemsSet.add('Grapes');
6uniqueItemsSet.add('Orange');
7
8// Checking if a value exists in the Set
9const hasGrapes = uniqueItemsSet.has('Grapes');
10
11// Deleting an item from the Set
12uniqueItemsSet.delete('Banana');
13
14// Iterating through the Set
15for (let item of uniqueItemsSet) {
16 console.log(item);
17}
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