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Added fibonacci sequence as well as fibonacci nth, renamed functions accordingly (#36)

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Oliver Hepworth-Bell
2018-06-02 07:31:09 +01:00
committed by Oleksii Trekhleb
parent a63bc67cf4
commit d267d72524
4 changed files with 59 additions and 27 deletions
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34
src/algorithms/math/fibonacci/fibonacci.js
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@ -1,26 +1,24 @@
// Calculate fibonacci number at specific position using Dynamic Programming approach.
export default function fibonacci(numberPosition) {
if (numberPosition === 1) {
return 1;
// Return a fibonacci sequence as an array
export default function fibonacci(n) {
const fibSequence = [1];
let currentValue = 1;
let previousValue = 0;
if (n === 1) {
return fibSequence;
}
let iterationsCounter = numberPosition - 1;
// Calculated fibonacci number.
let fib = null;
// Previous fibonacci number.
let fibPrev = 1;
// Before previous fibonacci number.
let fibPrevPrev = 0;
let iterationsCounter = n - 1;
while (iterationsCounter) {
// Calculate current value using two previous ones.
fib = fibPrev + fibPrevPrev;
// Shift previous values.
fibPrevPrev = fibPrev;
fibPrev = fib;
currentValue += previousValue;
previousValue = (currentValue - previousValue);
fibSequence.push(currentValue);
iterationsCounter -= 1;
}
return fib;
return fibSequence;
}