fib

Returns the fibonacci number at position n

Api

fib( n [, zeroOffset] )

Example

Traditional pattern
1, 1, 2, 3, 5, 8,13, 21, 34, 55, 89, 144, ...

var fib = require('fib')
 
fib(0) // 1
fib(1) // 1
fib(2) // 2
fib(3) // 3
fib(4) // 5
fib(50) // 20365011074

Example - zeroOffset = 1

Common modern use case
0, 1, 1, 2, 3, 5, 8,13, 21, 34, 55, 89, ...

var fib = require('fib')
 
fib(0, 1) // 0
fib(1, 1) // 1
fib(2, 1) // 1
fib(3, 1) // 2
fib(4, 1) // 3
fib(50, 1) // 12586269025

Example - zeroOffset = x

Use case: Delay sequence start for x n
[0 if n-zeroOffset < 0 ...], 1, 1, 2, 3, 5, 8,13, 21, 34, 55, 89, ...

var fib = require('fib')
 
function lostConnection(){
    var checkDelay = 15, checkDelayDecayAt = 100, checkCount = 0;
    (function checkForConnection(){
        if (haveConnection())
            return resumeApp()
        setTimeout( checkForConnection, checkDelay * fib(++checkCount, checkDelayDecayAt) )
    }());
}