dictionnary_functions.js

function command1(params) {
  if (params.length > 0) {
    console.log('command1 --> ', params);
  }
  return 0;
}

function command2(params) {
  if (params.length > 0) {
    console.log('command2 --> ', params);
  }
  return 0;
}

function command3(params) {
  if (params.length > 0) {
    console.log('command3 --> ', params);
  }
  return 0;
}

let dictionnary = {
  "command1": command1,
  "command2": command2,
  "command3": command3
};

function useCommand(cmd, params) {
  if (dictionnary.hasOwnProperty(cmd)) {
    return dictionnary[cmd](params);
  } else {
    console.log("Command not found, you must specify a valid one...");
    return 1;
  }
}

// Tests
useCommand('toto', []); // message + retourne 1
useCommand('command1', []); // rien + retourne 0
useCommand('command2', [1, 2, 3]); // affiche [1, 2, 3] + retourne 0
useCommand('command4', [1, 2, 3]); // message + retourne 1