Can you please explain what is happening in the loop?

Hi All,

looking to better my understanding here. Can you explain what is happening in the for loop? I get that it is iterating over each character in the string, but how does the statement search(str[i]) fit in? is this where the the case statement pushes the pairs depending on the argument passed into the function?

  **Your code so far**
function pairElement(str) {
var paired = [];
var search = function(char) {
  switch (char) {
    case "A":
    paired.push(["A", "T"]);
    break;
    case "T":
    paired.push(["T", "A"]);
    break;
    case "C":
    paired.push(["C","G"]);
    break;
    case "G":
    paired.push(["G","C"]);
    break;
  }
};

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

console.log(pairElement("GCG"));
  **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Challenge: DNA Pairing

Link to the challenge:

Yes, the for loop is calling the function search for each character in the string, and the function search pushes the base pairs into the array paired. Here is the logic with slightly different syntax:

function pairElement(str) {
  // Function to match each character with the base pair
  let matchWithBasePair = function(char, pairedArray) {
    switch (char) {
      case "A":
        pairedArray.push(["A", "T"]);
        break;
      case "T":
        pairedArray.push(["T", "A"]);
        break;
      case "C":
        pairedArray.push(["C", "G"]);
        break;
      case "G":
        pairedArray.push(["G", "C"]);
        break;
    }
  };

  // Find pair for every character in the string
  const paired = [];
  for (let i = 0; i < str.length; i++) {
    matchWithBasePair(str[i], paired);
  }

  return paired;
}

// test here
pairElement("GCG");