2.0 KiB
2.0 KiB
id | challengeType | title |
---|---|---|
5900f36e1000cf542c50fe81 | 5 | Problem 2: Even Fibonacci Numbers |
Description
1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
By considering the terms in the Fibonacci sequence whose values do not exceed n
th term, find the sum of the even-valued terms.
Instructions
Tests
tests:
- text: <code>fiboEvenSum(10)</code> should return 188.
testString: assert.strictEqual(fiboEvenSum(10), 188, '<code>fiboEvenSum(10)</code> should return 188.');
- text: <code>fiboEvenSum(23)</code> should return 60696.
testString: assert.strictEqual(fiboEvenSum(23), 60696, '<code>fiboEvenSum(23)</code> should return 60696.');
- text: <code>fiboEvenSum(43)</code> should return 1485607536.
testString: assert.strictEqual(fiboEvenSum(43), 1485607536, '<code>fiboEvenSum(43)</code> should return 1485607536.');
- text: Your function is not returning the correct result using our tests values.
testString: assert.strictEqual(fiboEvenSum(18), 3382, 'Your function is not returning the correct result using our tests values.');
- text: Your function should return an <code>even</code> value.
testString: assert.equal(fiboEvenSum(31) % 2 === 0, true, 'Your function should return an <code>even</code> value.');
Challenge Seed
function fiboEvenSum(n) {
// You can do it!
return true;
}
fiboEvenSum(10);
Solution
const fiboEvenSum = (number) => {
let temp, sum = 0, a = 0, b = 1;
while (number >= 0) {
temp = a;
a = b;
b += temp;
number --;
if ((b % 2) === 0) {
sum += b;
}
}
return sum;
}