Question

How to shift array elements to left by one position in JavaScript

Answer 1

function ShiftArrayToLeft(arr) {
    const size = arr.length;
        
    let temp = arr[0];
    
    for (let i = 0; i < size - 1; i++) {
        arr[i] = arr[i + 1];
    }
    
    arr[size - 1] = temp;
}

const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];

ShiftArrayToLeft(arr);

console.log(arr);




/*
run:

[2, 3, 4, 5, 6, 7, 8, 9, 1]

*/

 

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Answer 2

function ShiftArrayToLeft(arr) {
    let first = arr.shift();
    
    arr.push(first);
    
    return arr;
}

const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];

ShiftArrayToLeft(arr);

console.log(arr);




/*
run:

[2, 3, 4, 5, 6, 7, 8, 9, 1]

*/

 

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