How do I Determine the Newline Character Recognized by My Platform in JavaScript?

JavaScript String Newline Character

Unlike HTML, which uses
to define newlines, JavaScript utilizes specific character sequences within strings to denote line breaks. However, the universal newline character sequence, "n," is not universally recognized across all platforms.

To determine the appropriate newline character for the current environment, one can examine the result of a specific JavaScript expression. Consider the following:

function log_newline(msg, test_value) {
  if (!test_value) {
    test_value = document.getElementById("test").value;
  }
  console.log(
    msg +
      ": " +
      (test_value.match(/\r/) ? "CR" : "") +
      " " +
      (test_value.match(/\n/) ? "LF" : "")
  );
}

log_newline("HTML source");
log_newline("JS string", "foo\nbar");
log_newline("JS template literal", `bar
baz`);

By providing different test strings, you can identify the newline characters recognized by your current platform, including "CR" (carriage return) and "LF" (line feed).

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