Using the Spread Operator to Evaluate Arrays In-Place Tests

JS

// this is a common function just to write the content into the result div
function write_result(result) {
  var result_html = document.getElementById("result");
  result_html.innerHTML = result;
}

function show_max_array() {
  "use strict";
  const an_array = [1,5,8,34,56];
  var the_max = Math.max.apply(null, an_array);
  return the_max;
}

function show_max_array_spread() {
  "use strict";
  const an_array = [1,5,8,34,58];
  var the_max = Math.max(...an_array); // this version skips the apply step and uses the ... spread operator instead to convert the array to values. this only works inline.
  return the_max;
}

// im not sure why this would be useful, but you can copy an array this way as well. it converts the array into comma seperated values.
function copy_array_spread() {
  const an_array = [1,5,8,34,58];
  let another_array = [...an_array];
  return another_array;
}

HTML

<div id='result' class='mb-3 alert alert-primary'>..</div>
<button onclick='write_result(show_max_array());' class='btn btn-primary mb-1'>Run Function - show_max_array</button>
<button onclick='write_result(show_max_array_spread());' class='btn btn-primary mb-1'>Run Function - show_max_array_spread</button>  <button onclick='write_result(copy_array_spread());' class='btn btn-primary mb-1'>Run Function - show_max_array_spread</button>

Working Result

Test Result Below