freeCodeCamp/sum-all-numbers-in-a-range.english.md at cb3db952ee2921a7a8b84e2872154009ca3c1e81

Valeriy 79d9012432 fix(curriculum): quotes in tests (#18828 )

* fix(curriculum): tests quotes

* fix(curriculum): fill seed-teardown

* fix(curriculum): fix tests and remove unneeded seed-teardown

2018-10-20 23:32:47 +05:30

1.8 KiB

Raw Blame History

id, title, isRequired, challengeType

id	title	isRequired	challengeType
a3566b1109230028080c9345	Sum All Numbers in a Range	true	5

Description

We'll pass you an array of two numbers. Return the sum of those two numbers plus the sum of all the numbers between them. The lowest number will not always come first. Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Instructions

Tests

tests:
  - text: <code>sumAll([1, 4])</code> should return a number.
    testString: assert(typeof sumAll([1, 4]) === 'number', '<code>sumAll([1, 4])</code> should return a number.');
  - text: <code>sumAll([1, 4])</code> should return 10.
    testString: assert.deepEqual(sumAll([1, 4]), 10, '<code>sumAll([1, 4])</code> should return 10.');
  - text: <code>sumAll([4, 1])</code> should return 10.
    testString: assert.deepEqual(sumAll([4, 1]), 10, '<code>sumAll([4, 1])</code> should return 10.');
  - text: <code>sumAll([5, 10])</code> should return 45.
    testString: assert.deepEqual(sumAll([5, 10]), 45, '<code>sumAll([5, 10])</code> should return 45.');
  - text: <code>sumAll([10, 5])</code> should return 45.
    testString: assert.deepEqual(sumAll([10, 5]), 45, '<code>sumAll([10, 5])</code> should return 45.');

Challenge Seed

function sumAll(arr) {
  return 1;
}

sumAll([1, 4]);

Solution

function sumAll(arr) {
  var sum = 0;
  arr.sort(function(a,b) {return a-b;});
  for (var i = arr[0]; i <= arr[1]; i++) {
    sum += i;
  }
  return sum;
}

1.8 KiB Raw Blame History