Created a function that takes in a parameter, that is then looped and called until end. Function is a switch statement.

DNA Pairing

// Docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/switch
// https://guide.freecodecamp.org/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing

function pairElement(str) {
  var paired = [];

  var search = function(char) {
    switch (char) {
      case 'A':
        console.log("a found");
        paired.push(['A', 'T']);
        break;
      case 'T':
        console.log("t found");
        paired.push(['T', 'A']);
        break;
      case 'C':
        console.log("c found");
        paired.push(['C','G']);
        break;
      case 'G':
        console.log("g found");
        paired.push(['G','C']);
        break; 
    }
  }

  for (var i = 0; i < str.length; i++) {
    search(str[i]);
  }
  
  return paired;
}

pairElement("GCG");