10 JavaScript Programming Tips

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🔄Tip 1: Use destructuring assignment to exchange variable values

let a = 1;
let b = 2;

[a, b] = [b, a];

console.log(a); // Output 2
console.log(b); // Output 1

This method makes it easy to swap the values of two variables without introducing a third variable.

🎁 Tip 2: Use array destructuring to obtain function return values

function getNumbers() {
   return [1, 2, 3];
}

const [a, b, c] = getNumbers();

console.log(a); // Output 1
console.log(b); // Output 2
console.log(c); // Output 3

This way you can easily get multiple return values from a function.

🙋‍♂️ Tip 3: Use default parameters

function greet(name = 'Guest') {
  console.log(`Hello ${name}!`);
}

greet(); // prints Hello Guest!
greet('John'); // prints Hello John!

This approach avoids checking in the function whether a parameter is passed and uses the parameter value if so, otherwise uses the default value.

🔗 Tip 4: Use the spread operator to merge arrays

const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];

const mergedArr = [...arr1, ...arr2];

console.log(mergedArr); // prints [1, 2…