Array chunking function for Underscore.js. Usage: _.chunks([1,2,3,4,5,6,7], 2) => [[1,2],[2,3],[4,5],[5,6],[7]]

chunk.js

_.mixin({
    chunks: function(arr, size) {
        var len = arr.length,
            chunk_len = Math.ceil(len/size),
            chunks = []; 
        for (var i = 0; i < chunk_len; i++) {
            chunks.push(arr.slice(i*size, (i+1)*size));
        }   
        return chunks;
    }   
});