# 6.11. More Code Practice with ArraysΒΆ

Create a function sum13(nums) that takes an array of integers, nums and returns the sum of the numbers in the array. However, the number 13 is very unlucky, so do not add it or the number that comes immediately after a 13 to the sum. Return 0 if nums is an empty array.

Example Input

Expected Output

sum13({13, 1, 2})

2

sum13({1,13})

1

sum13({4, 13, 8})

4

sum13({13, 1, 13, 3, 2})

2

sum13({})

0

Create a function has22(nums) that takes an array of integers, nums and returns true if there are at least two items in the list that are adjacent and both equal to 2, otherwise return false.

Example Input

Expected Output

has22({1, 2, 2})

true

has22({2, 1, 2})

false

has22({2, 2, 8})

true

has22({3, 3, 5})

false

Create the total89(nums) function below that takes an array of integers, nums, and returns the total of the numbers in nums except for all numbers in the array between an 8 and a 9 (inclusive).

Example Input

Expected Output

total89({1, 2})

3

total89({2, 8, 3, 9, 2})

4

total89({8, 3, 5, 9, 6})

6

Create a function twoSum(nums, target) that takes an array of integers nums and an integer target and returns an array with the indices of two numbers such that they add up to target. If no two numbers add up to target, it returns an empty array. Assume that each input has exactly one solution, and you may not use the same element twice.

Example Input

Expected Output

twoSum({2,7,11,15}, 9)

{0, 1}

twoSum({2,7,11,15}, 13)

{0, 2}

twoSum({2,7,11,15}, 5)

{}