JavaScript provides powerful built-in methods to manipulate arrays efficiently.

These methods help with adding, removing, transforming, searching, and iterating through array elements.

👉 The push() method adds new items to the end of an array.

👉 The push() method changes the length of the array.

👉 The push() method returns the new length.

Syntax: array.push(item1, item2, ..., itemX)

👉 The pop() method removes (pops) the last element of an array.

👉 The pop() method changes the original array.

👉 The pop() method returns the removed element.

Syntax: array.pop()

👉 The shift() method removes the first element from an array.

👉 It changes the original array and returns the removed element.

Syntax: array.shift()

👉 The unshift() method adds one or more elements to the beginning of an array.

👉 It returns the new length of the array.

Syntax: array.unshift(item1, item2, ..., itemX)

👉 The splice() method can be used to add or remove elements at a specified index.

👉 It modifies the original array and returns the removed items.

Syntax: array.splice(start, deleteCount, item1, ..., itemX)

👉 The reverse() method reverses the order of the elements in an array.

👉 It modifies the original array.

Syntax: array.reverse()

👉 The sort() method sorts the elements of an array.

👉 By default, it sorts alphabetically. For numbers, a compare function is needed.

Syntax: array.sort() or array.sort(compareFunction)

👉 The fill() method fills elements in an array with a static value.

👉 It changes the original array.

Syntax: array.fill(value, start, end)

👉 The concat() method is used to merge two or more arrays.

👉 It returns a new array without changing the existing arrays.

Syntax: array1.concat(array2, array3, ..., arrayX)

👉 The join() method joins all array elements into a single string.

👉 You can specify a separator (like comma, space, dash, etc).

Syntax: array.join(separator)

👉 The slice() method returns a shallow copy of a portion of an array.

👉 It does not modify the original array.

Syntax: array.slice(start, end)

👉 The includes() method checks if an array contains a certain value.

👉 It returns true or false.

Syntax: array.includes(element, start)

👉 The indexOf() method returns the first index of the element in the array.

👉 Returns -1 if not found.

Syntax: array.indexOf(element, start)

👉 The lastIndexOf() method returns the last index of the element in the array.

👉 Returns -1 if not found.

Syntax: array.lastIndexOf(element, start)

👉 The toString() method converts an array to a comma-separated string.

👉 It does not modify the original array.

Syntax: array.toString()

👉 The forEach() method calls a function once for each array element.

👉 It does not return a new array.

Syntax: array.forEach(callback)

👉 The map() method creates a new array with the results of calling a function on every element.

Syntax: array.map(callback)

👉 The filter() method creates a new array with all elements that pass the test implemented by the function.

Syntax: array.filter(callback)

👉 The reduce() method executes a reducer function on each element and returns a single output value.

Syntax: array.reduce(callback, initialValue)

👉 The some() method tests whether at least one element in the array passes the test function.

Syntax: array.some(callback)

👉 The every() method checks if all elements in the array pass the test function.

Syntax: array.every(callback)

👉 The find() method returns the first element that satisfies the provided testing function.

Syntax: array.find(callback)

👉 The findIndex() method returns the index of the first element that satisfies the testing function.

Syntax: array.findIndex(callback)