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* fix: remove isHidden flag from frontmatter * fix: add isUpcomingChange Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com> * feat: hide blocks not challenges Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com> Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com>
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id, title, isRequired, challengeType, forumTopicId
id | title | isRequired | challengeType | forumTopicId |
---|---|---|---|---|
a5229172f011153519423690 | Sum All Odd Fibonacci Numbers | true | 5 | 16084 |
Description
num
, return the sum of all odd Fibonacci numbers that are less than or equal to num
.
The first two numbers in the Fibonacci sequence are 1 and 1. Every additional number in the sequence is the sum of the two previous numbers. The first six numbers of the Fibonacci sequence are 1, 1, 2, 3, 5 and 8.
For example, sumFibs(10)
should return 10
because all odd Fibonacci numbers less than or equal to 10
are 1, 1, 3, and 5.
Instructions
Tests
tests:
- text: <code>sumFibs(1)</code> should return a number.
testString: assert(typeof sumFibs(1) === "number");
- text: <code>sumFibs(1000)</code> should return 1785.
testString: assert(sumFibs(1000) === 1785);
- text: <code>sumFibs(4000000)</code> should return 4613732.
testString: assert(sumFibs(4000000) === 4613732);
- text: <code>sumFibs(4)</code> should return 5.
testString: assert(sumFibs(4) === 5);
- text: <code>sumFibs(75024)</code> should return 60696.
testString: assert(sumFibs(75024) === 60696);
- text: <code>sumFibs(75025)</code> should return 135721.
testString: assert(sumFibs(75025) === 135721);
Challenge Seed
function sumFibs(num) {
return num;
}
sumFibs(4);
Solution
function sumFibs(num) {
var a = 1;
var b = 1;
var s = 0;
while (a <= num) {
if (a % 2 !== 0) {
s += a;
}
a = [b, b=b+a][0];
}
return s;
}