Move all negative elements to end in typescript

Ts program for Move all negative elements to end. Here more solutions.

// TypeScript program for
// Move all negative elements at the end of array
class MyArray
{
	// Display array elements
	public display(arr: number[])
	{
		console.log(arr);
		console.log();
	}
	// Swap the given array elements
	public swap(arr: number[], start: number, end: number)
	{
		var temp = arr[start];
		arr[start] = arr[end];
		arr[end] = temp;
	}
	// Method which is move negative elements
	public moveNegative(arr: number[], n: number)
	{
		// first index
		var i = 0;
		// last index
		var j = n - 1;
		while (i < j)
		{
			if (arr[i] < 0 && arr[j] >= 0)
			{
				// When [i] index are have negative value 
				// And [j] is positive then swapping elements values
				this.swap(arr, i, j);
				// Modified index
				i++;
				j--;
			}
			else if (arr[i] >= 0)
			{
				// When element of [i] is not negative
				i++;
			}
			else
			{
				j--;
			}
		}
	}
	public static main(args: string[])
	{
		var task = new MyArray();
		// Array which are containing positive and negative values
		var arr: number[] = [1, -1, 3, 2, -7, -5, 11, 6];
		var n = arr.length;
		console.log("Before Arrange : ");
		// Before move element
		task.display(arr);
		// Move negative elements
		task.moveNegative(arr, n);
		// After arrange
		console.log("After Arrange : ");
		// After move element
		task.display(arr);
	}
}
MyArray.main();
/*
 file : code.ts
 tsc --target es6 code.ts
 node code.js
 */

Output

Before Arrange :
[ 1, -1, 3, 2, -7, -5, 11, 6 ]

After Arrange :
[ 1, 6, 3, 2, 11, -5, -7, -1 ]