Question

How to split an array and add the first part to end in JavaScript

Answer 1

class CArray {
    print(arr) {
      	const size = arr.length;
         
        let s = "";
        for (let i = 0; i < size; i++) {
            s += arr[i] + " ";
        }
        console.log(s);
    }
    reverse(arr, start, end) {
        for (let i = start, j = end; i <= end && j > i; i++, j--) {
            let temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
        }
    }
    split(arr, split_point) {
        const size = arr.length;
         
        if (size <= 1 && split_point < 1 && split_point >= size) {
            return;
        }
 
        // reverse first part
        this.reverse(arr, 0, split_point - 1);
         
        // reverse second part
        this.reverse(arr, split_point, size - 1);
         
        // reverse all array 
        this.reverse(arr, 0, size - 1);
    }
}
 
 
const obj = new CArray();
     
const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
 
let split_point = 3;
     
obj.split(arr, split_point);
 
obj.print(arr); 
     
     
     
     
/*
run:
        
"4 5 6 7 8 9 0 1 2 3 "
        
*/ 

 

 

70+ SQL courses for beginners and professionals