var x = d3.scaleLinear([0,size.width])
    //don't put the range here--^
    .domain(d3.extent(data,d => d.booked))

var x = d3.scaleLinear()
    .range([0, size.width])
    .domain(d3.extent(data, d => d.booked))

d3.scaleOrdinal([range])
//range here-------^

d3.scaleOrdinal()
    .range([foo])
    .domain([bar])

d3.scaleOrdinal([foo])
    .domain([bar])