index.test.js

const {removeNumAndGetLength} = require('.');

/**
 Problem description: Given an array nums and a value val, remove all instances of that value in-place and return the new length.
 
 Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
 
 The order of elements can be changed. It doesn't matter what you leave beyond the new length.
 
 Example 1:
 Given nums = [3,2,2,3], val = 3,
 Your function should return length = 2, with the first two elements of nums being 2.
 It doesn't matter what you leave beyond the returned length.
 
 Example 2:
 Given nums = [0,1,2,2,3,0,4,2], val = 2,
 Your function should return length = 5, with the first five elements of nums containing 0, 1, 3, 0, and 4.
 */
test('remove elements and should return the new length of the array', () => {
  // Arrange
  const nums = [3, 2, 2, 3];
  
  // Act
  const result = removeNumAndGetLength(nums, 2);
  
  // Assert
  expect(result).toBe(2);
});

test('remove elements and should return the new length of the array', () => {
  // Arrange
  const nums = [0, 1, 2, 2, 3, 0, 4, 2];
  
  // Act
  const result = removeNumAndGetLength(nums, 2);
  
  // Assert
  expect(result).toBe(5);
});