Generating Fibonacci Sequence

javascript fibonacci
methuselah picture methuselah · Oct 30, 2011 · Viewed 181.2k times · Source 
var x = 0;
var y = 1;
var z;

fib[0] = 0;
fib[1] = 1;

for (i = 2; i <= 10; i++) {
  alert(x + y);
  fib[i] = x + y;
  x = y;
  z = y;
}

I'm trying to get to generate a simple Fibonacci Sequence but there no output.

Can anybody let me know what's wrong?

Answer

Rob W picture Rob W · Oct 30, 2011

You have never declared fib to be an array. Use var fib = []; to solve this.

Also, you're never modifying the y variable, neither using it.

The code below makes more sense, plus, it doesn't create unused variables:

var i;
var fib = []; // Initialize array!

fib[0] = 0;
fib[1] = 1;
for (i = 2; i <= 10; i++) {
  // Next fibonacci number = previous + one before previous
  // Translated to JavaScript:
  fib[i] = fib[i - 2] + fib[i - 1];
  console.log(fib[i]);
}

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