ES6 Default Function Arguments

es6_default_function_arguments.js

// ES6 Default Function Arguments
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters
function sayHi(target = 'everyone') {
 console.log('Hi ', target, '!');
}

sayHi('Alice'); // Hi Alice!
sayHi(); // Hi everyone!

// ES5 compatible syntax transpiled by es6-transpiler
// https://github.com/termi/es6-transpiler
var sayHi = function() {
 var target = arguments[0];
 if(target === void 0) target = 'everyone';

 console.log('Hi ', target, '!');
};