Javascript Array:Shift & unshift

 

//shift -alter original array give first element of array after remving from original array

let languages = ["java","javascript","Go"]

let firstLanguage = languages.shift()

console.log(languages)

console.log(firstLanguage)

//unshfit

let cities = ["noida","delhi","pune","nagpur"]//

let new_cities = cities.unshift("mumbai")//return new length of array prior add new element to beginning of array

console.log(cities)

console.log(new_cities)

Output:

PS C:\Users\sangr\Practice> node .\unshift.sh

[ 'javascript', 'Go' ]

java

PS C:\Users\sangr\Practice> node .\unshift.sh

[ 'javascript', 'Go' ]

java

[ 'mumbai', 'noida', 'delhi', 'pune' ]

4

PS C:\Users\sangr\Practice> node .\unshift.sh

[ 'javascript', 'Go' ]

java

[ 'mumbai', 'noida', 'delhi', 'pune', 'nagpur' ]