Colors every other word in a string by wrapping <span> tags around it.

colorEveryOther.js

function colorEveryOther(str) {
  var arr = str.split(" ");
  for (var i = 0; i < arr.length; i++) {
    if (i % 2 === 0) {
      arr[i] = "<span>" + arr[i] + "</span>";
    }
  }
  var newStr = arr.join(" ");
  return newStr;
}