Comment by pornel

ES6 is especially nice with D3.js:

    .attr('transform', function(d) { return "translate(" + (d.x + 1) + " 0)"; })

becomes:

    .attr('transform', d => `translate(${d.x + 1} 0)`)

And:

    .attr({x:x, y:y, width:width, height:height})
    
    .attr({x, y, width, height})