Rotate

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Rotate

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script.js

/*
Rotate Challenge - Fullstack JavaScript JumpStart

Rotate an array to the right by a certain number of "steps". 

For example, the array to rotate is: [1,2,3,4,5,6,7] and 
will be rotated 3 "steps".  The final array will look like: [5,6,7,1,2,3,4].  

Notice the position of each index is shifted to the right by 3 places.

*/

// Write Code Below

function rotate(arr, steps){
	var index;

	while(steps > 0){
		index = arr.pop();
		arr.unshift(index);

		steps--;
	}
  return arr;
}











































































































































































describe('rotate', function(){
  it('rotate is a function', function(){
    expect(typeof rotate).toEqual('function');
  });

  it('rotate returns an Array', function(){
    expect(Array.isArray(rotate([22,11,500,92],2))).toEqual(true);
  });

  it('rotate moves each index to the right based on amount of "steps"', function(){
    expect(rotate([22,11,500,92],2)).toEqual([500,92,22,11]);
    expect(rotate([1,2,3,4,5], 3)).toEqual([3,4,5,1,2]);
  });

  it('if an index is at the end of the array, it will move to the front on the next step', function(){
    expect(rotate([11,15,28,9,10,1],1)).toEqual([1,11,15,28,9,10]);
  });

  it('does not rotate if the amount of "steps" is zero', function(){
    expect(rotate([1,2,3,4], 0)).toEqual([1,2,3,4]);
  });
});