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function repeatStringNumTimes(str, num) {
  // Empty array to hold strings later
  var holderArray = [];
  for (var i = 0; i < num; i++) {
    // Pushes strings into array based on number of times requested
    holderArray.push(str);
  }
  // Turn output into single string
  str = holderArray.join("");
  return str;
}

// Example call
repeatStringNumTimes("abc", 3);