node. JS Arrow function

• Format: = = (read: Goesto) The left is the argument, the right is the method body
• Evolution: function f (x, y) {}-----> evolved into arrow functions

  (x, y) + = {} syntax is simple to format

  • • Several forms of the arrow function:

      • No parameters () = Console.log ("Hello");
      • There is a parameter a = = ++a;

      • There are multiple parameters (a, b), + A + C;

      • The method body has more than one statement (A, b), = {a=1; b=2; Console.log (A+b)};

    • Considerations for Arrow Functions
      • The arrow function does not affect the point of this
      • The arrow function does not have its own this, the inside of the arrow function This is the outer code block of this
      • There is no arguments object in the arrow function, and the inner arguments of the arrow function points to the arguments of the outer function
      • cannot be used as a constructor
  • ES6 's Learning Site
    • Support for ES6 in each browser http://kangax.github.io/compat-table/es6/
    • Learning site http://es6.ruanyifeng.com/#README

node. JS Arrow function