Shifting is equivalent to popping, working on the first element instead of the last.
The shift() method removes the first array element and "shifts" all other elements to a lower index.
Example
const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.shift(); // Removes "Banana" from fruits
fruits.shift(); // Removes "Banana" from fruits
The shift() method returns the value that was "shifted out":
Example
const fruits = ["Banana", "Orange", "Apple", "Mango"];
let x = fruits.shift(); // x = "Banana"
let x = fruits.shift(); // x = "Banana"
The unshift() method adds a new element to an array (at the beginning), and "unshifts" older elements:
Example
const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.unshift("Lemon"); // Adds "Lemon" to fruits
fruits.unshift("Lemon"); // Adds "Lemon" to fruits
The unshift() method returns the new array length.
Example
const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.unshift("Lemon"); // Returns 5
fruits.unshift("Lemon"); // Returns 5
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