With ES6: This is now part of the language: function myFunc(a, b = 0) { // function body }. Please keep in mind that ES6 checks the values ... ... <看更多>

In JavaScript, a parameter has a default value of undefined. It means that if you don't pass the arguments into the function, its parameters will have the ... ... <看更多>

JavaScript Snippet. // Supply default values for parameters // Before, using ES5... function greetES5(message, to) { // Test parameter values in the ... ... <看更多>

Summary: in this tutorial, you will learn how to use the TypeScript optional parameters for functions. In JavaScript, you can call a function without ... ... <看更多>

someFunction(a, b, x = false) { // a and b are strings, x is true or false ... } In either case, the function can be called without x : ... <看更多>

optional parameters, default values and type-checking for your JavaScript method ... function range(){ arguments = __({start: [Number, 0], stop: Number, ... ... <看更多>