Question

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

Answer 1

function ShiftArrayToLeft(arr : number[]) {
    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 : number[] = [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 : number[]) {
    let first : number = arr.shift();

    arr.push(first);
     
    return arr;
}
 
const arr : number[] = [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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