text: "use strict";
  // [error tutorial](https://babeljs.io/docs/plugins/preset-es2015/)
  
  // [NPM : babel-preset-es2015](https://www.npmjs.com/package/babel-preset-es2015)
  /*
  >$ babel index.js --presets es2015 
  */
  
  // input codes
  
  var n = 7;
  console.log([1, 2, 3].map(n = +1));
  
  var square = function square(n) {
      return n * n;
  };
  
  /*
  // output result
  
  var n = 3;
  console.log([1, 2, 3].map(n = + 1)); 
  
  var square = function square(n) {
      return n * n;
  };
  */