Array Method in JS - shift and unshift

Hello Today i will be discussing about inbuilt unshift() and shift() method of Arrays.

Let's get started...

Unshift - It is used to insert an element at the start of the array.
shift - It is used to remove the first element from the array.

Code Example -

const array = [1,2,3,4,5];
const array2 = ["This","is","array2"]

array.unshift(6) //single element insertion
array.unshift(7,8,9) // multiple element insertion
array.unshift("BOOTSTRAP5") // string element insertion
array.unshift("TAILWINDCSS","REACT JS") //multiple string element insertion
array.unshift([10,11]) // number array insertion
array.unshift(["NODE JS","MONGO DB"]) // string array insertion
array.unshift([[12,13],[14,15]]) // 2-d array insertion
array.unshift({name:"shubham",age:21}) // Object insertion
array.unshift(array2) // array stored in a variable then inserted 
array.unshift(undefined,null) // undefined and null insertion
array.unshift(true,false) // Boolean insertion
array.unshift(array) // [Circular *1]


console.log(array)


array.shift() // pop out the first element
array.shift() // pop out the first element
console.log("\n\nAfter shifting 2 times")
console.log(array)

Output -

<ref *1> [
  [Circular *1],
  true,
  false,
  undefined,
  null,
  [ 'This', 'is', 'array2' ],
  { name: 'shubham', age: 21 },
  [ [ 12, 13 ], [ 14, 15 ] ],
  [ 'NODE JS', 'MONGO DB' ],
  [ 10, 11 ],
  'TAILWINDCSS',
  'REACT JS',
  'BOOTSTRAP5',
  7,
  8,
  9,
  6,
  1,
  2,
  3,
  4,
  5
]


After shifting 2 times
[
  false,
  undefined,
  null,
  [ 'This', 'is', 'array2' ],
  { name: 'shubham', age: 21 },
  [ [ 12, 13 ], [ 14, 15 ] ],
  [ 'NODE JS', 'MONGO DB' ],
  [ 10, 11 ],
  'TAILWINDCSS',
  'REACT JS',
  'BOOTSTRAP5',
  7,
  8,
  9,
  6,
  1,
  2,
  3,
  4,
  5
]

• As you can see we can insert many tyes of elements at the first index in the array.
• At the last insert, we have pushed the array itself and it returned "[Circular *1] , Circular reference is a references where an object references itself directly or indirectly through an object.
• After using shift() two times, the first two elements are removed.

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Also check these posts as well
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https://dev.to/shubhamtiwari909/tostring-in-js-27b

https://dev.to/shubhamtiwari909/join-in-javascript-4050

https://dev.to/shubhamtiwari909/going-deep-in-array-sort-js-2n90