Question

How to reverse one dimensional int array in JavaScript

Answer 1

function reverse_one_dimensional_array(arr) {
    for (let i = 0; i < arr.length / 2; i++) {
        tmp = arr[i];
        arr[i] = arr[arr.length - 1 - i];
        arr[arr.length - 1 - i] = tmp;
    } 
}

let arr = [1, 2, 3, 4, 5, 6, 7];

reverse_one_dimensional_array(arr);

console.log(arr);  



/*
run:

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

*/

 

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Answer 2

let arr = [1, 2, 3, 4, 5, 6, 7];

arr.reverse();

console.log(arr);  



/*
run:

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

*/

 

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