Look-and-Say Sequence Generator

LookAndSaySeq.js

var list = [1];
var N = 10;

for(var i = 0; i < N; i++){ 
    list = list.reduce(function(prev, cur, index, array){
        var last = prev.splice(prev.length - 2);
        if(cur === last[1]){ 
            last[0]++; 
        } else {
            last.push(1, cur);
        }
        return prev.concat(last);
    }, [0,list[0]]);
    console.log(list);
}

LookAndSaySeq.md

Description

Generator of the Look and Say sequence in JavaScript.

See

• http://en.wikipedia.org/wiki/Look-and-say_sequence
• https://oeis.org/A034002

Example

       1         : One
      1 1        : One one
      2 1        : Two ones
    1 2 1 1      : One two, one one
  1 1 1 2 2 1    : One one, one two, two ones
  3 1 2 2 1 1    : Three ones, two twos, one one
1 3 1 1 2 2 2 1  : One three, one one, two twos, two ones
      ...