erik-challenge.js

var data = [['B1','B2','B3'],[1,2,3],[4,5,6],[7,8,9]];

// this would normally be provided by some sort of functional lib (or in a real functional language)
function zipObject(keys, vals) {
    var zip = {};
    keys.forEach(function(k,i) {zip[k] = vals[i];});
    return zip;
}

function car(arr) {
    return arr[0];
}

function cdr(arr) {
    return arr.slice(1, arr.length);
}

function generateWantedData(columnNames, data) {
    // map over data, zipObject for each column name
    console.log(data);
    return data.map(function(val) {
        return zipObject(columnNames, val);
    });
}

console.log(generateWantedData(car(data), cdr(data)));