How to use "readline()" function in JavaScript?

Question

I was learning 去哪儿网-2017笔试题 and programing. In my program, I want to use readline() function to read a single line from input from stdin. I know that readline() function belongs to JavaScript Shell according to MDN. But the function is not defined when I run the code in my browser.

var line;
while (line = read_line()) {
  while (line.indexOf(" ") != -1) {
    line = line.replace(" ", "");
  }
  if (line.length <= 6) {
    print(line);
  } else if (line.length > 6 && line.length <= 14) {
    var line1 = line.substring(0, 6);
    var line2 = line.substring(6);
    print(line1 + " " + line2);
  } else if (line.length > 14 && line.length <= 18) {
    var line1 = line.substring(0, 6);
    var line2 = line.substring(6, 14);
    var line3 = line.substring(14);
    print(line1 + " " + line2 + " " + line3);
  }
}

If I want to run the code in my browser. What should I do?

Thank you very much.

From where are you expecting to read? You do not have a file. Browser based JS does not have stdin - or are you talking node.js? — mplungjan
– mplungjan, Commented Mar 10, 2017 at 15:27
It's for the js shell command line program which has nothing to do with js within a web browser. Where would it even read from? — Alex K.
– Alex K., Commented Mar 10, 2017 at 15:28
The function, and the mdn page you link to, are about writing programs for the JavaScript shell, jsc. You can't run it in a browser. — Jared Smith
– Jared Smith, Commented Mar 10, 2017 at 15:29
@mplungjan its jsc. Predates (and largely superceded by) node. — Jared Smith
– Jared Smith, Commented Mar 10, 2017 at 15:31

Ezequiel De Simone · Accepted Answer · 2017-06-19 14:12:58Z

1

As you mentioned above and the documentation says Introduction to the JavaScript shell

it is a command line options and you have to run that over the command shell. Also, you can check SpiderMonkey to have a better understanding.

answered Jun 19, 2017 at 14:12

Ezequiel De Simone

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