Basic Array Operations
Adding and Removing Elements
const initialArray = [1, 2, 3, 4, 5];
// Remove the last element
const removedLastElement = initialArray.pop();
console.log(removedLastElement); // 5
console.log(initialArray); // [1, 2, 3, 4]
// Remove the first element
const removedFirstElement = initialArray.shift();
console.log(removedFirstElement); // 1
console.log(initialArray); // [2, 3, 4]
// Add an element to the end
initialArray.push(6);
console.log(initialArray); // [2, 3, 4, 6]
// Add an element to the beginning
initialArray.unshift(1);
console.log(initialArray); // [1, 2, 3, 4, 6]Concatenating Arrays
const initalArray = [1, 2, 3];
const secondaryArray = [4, 5, 11];
const res = initialArray.concat(secondaryArray);
console.log(res); // [1, 2, 3, 4, 5, 11]Traversals
- forEach() - Iterates over the elements of an array.
const initialArray = [1, 23, 444];
for (let i = 0; i < initialArray.length; i++) {
console.log(initialArray[i]);
}
initialArray.forEach((element) => {
console.log(element);
});Explanation: The forEach() uses callback function to iterate over the elements of an array. The callback function is called with each element and its index as arguments.
Map() and filter() are covered here.