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recursion.js
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39 lines (33 loc) · 890 Bytes
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// Complete the following functions.
const nFibonacci = (n) => {
// fibonacci sequence: 1 1 2 3 5 8 13 ...
// return the nth number in the sequence
if (n <= 1) {
return n;
} return nFibonacci(n - 1) + nFibonacci(n - 2);
};
const nFactorial = (n) => {
// factorial example: !5 = 5 * 4 * 3 * 2 * 1
// return the factorial of `n`
if (n === 0) {
return 1;
} return n * nFactorial(n - 1);
};
/* Extra Credit */
const checkMatchingLeaves = (obj, c) => {
// return true if every property on `obj` is the same
// otherwise return false
if (Object.keys(obj)[0] !== Object.keys(obj)[c]) {
return false;
} else if (Object.keys(obj)[0] === Object.keys(obj)[c]) {
return true;
}
checkMatchingLeaves(c + 1);
};
// attempted but failed, oh well!
/* eslint-enable no-unused-vars */
module.exports = {
nFibonacci,
nFactorial,
checkMatchingLeaves,
};