Как я могу получить доступ ко всем ключам и значениям в массиве объектов без цикла

d3.csv("https://raw.githubusercontent.com/nickrinaldi88/BreitBart_DataVis/main/breitbartData.csv").then(function(csv) {
  
  var current_data = {};
  var parse = d3.timeParse("%Y-%m-%d")
  
  for(var i=0; i < csv.length; i++) {
    var item = csv[i];
    if (!current_data[item.Word]) current_data[item.Word] = [];
         
    current_data[item.Word].push({
      date:parse(item.Date),
      count:item.Count
    })
  }
  
d3.select("select")
  .selectAll("option")
  .data(Object.keys(current_data))
  .enter()
  .append("option")
  .text(function(d) { return d; });
  
d3.select("select")
  .on("change", function() {
    update(current_data[this.value])
  })
  
  
  
// set the dimensions and margins of the graph
var margin = {top: 10, right: 30, bottom: 30, left: 50},
    width = 460 - margin.left - margin.right,
    height = 250 - margin.top - margin.bottom;

// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
  .append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform",
          "translate(" + margin.left + "," + margin.top + ")");

// Initialise a X axis:
var x = d3.scaleTime().range([0,width]);
var xAxis = d3.axisBottom().scale(x);
svg.append("g")
  .attr("transform", "translate(0," + height + ")")
  .attr("class","myXaxis")

// Initialize an Y axis
var y = d3.scaleLinear().range([height, 0]);
var yAxis = d3.axisLeft().scale(y);
svg.append("g")
  .attr("class","myYaxis")

// Create a function that takes a dataset as input and update the plot:
function update(data) {

  // Create the X axis:
  x.domain(d3.extent(data, function(d) { return d.date }) );
  svg.selectAll(".myXaxis").transition()
    .duration(3000)
    .call(xAxis);

  // create the Y axis
  y.domain([0, d3.max(data, function(d) { return +d.count  }) ]);
  svg.selectAll(".myYaxis")
    .transition()
    .duration(3000)
    .call(yAxis);

  // Create a update selection: bind to the new data
  var u = svg.selectAll(".lineTest")
    .data([data]);

  // Updata the line
  u
    .enter()
    .append("path")
    .attr("class","lineTest")
    .merge(u)
    .transition()
    .duration(3000)
    .attr("d", d3.line()
      .x(function(d) { return x(d.date); })
      .y(function(d) { return y(d.count); }))
      .attr("fill", "none")
      .attr("stroke", "steelblue")
      .attr("stroke-width", 2.5)
}

// At the beginning, I run the update function on the first dataset:
update(current_data.Obama)

 

})

path {
  stroke-width: 1px;
  stroke: black;
}

<script src = "https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<select></select>
<div id = "my_dataviz"></div>