Arrow Function => in ES6

The let keyword in ES6

Default Values for Function Parameters in ES6

const Declarations in es6 (ES2015)

Shorthand Properties in ES6

Object Enhancements in ES6

Using the ES6 spread operator

Use Template Literals in ES6

Destructuring Assignment in ES6

ES6 Modules (ES2015) - Import and Export

Promises with ES6

ES6 (ES2015) - Generators

Maps and WeakMaps with ES6

ES6 Parameter Object Destructuring with Required Values 

ES6 Rest Parameters

Learn ES6 (ECMAScript 2015)

Not only can you provide default values when using ES6 parameter object destructuring, but you can also require the presence of certain properties

[00:01] What we have here is an AJAX function using ESX parameter object to structuring and we're providing default values. As you can see, when we call our AJAX function we're getting not only the values we passed into the function, but we're also getting default values for the things we didn't pass like type, data, and is async.

[00:20] We could, at this point, remove the URL and success properties when calling the AJAX function, and you'll see we're providing default values for them, but that doesn't seem quite right. Those properties should probably be required, so let's do that.

[00:33] What we're going to do is come up here and create a new function called required parameter, and give it a name of parameter. Then we're going to throw a new error, and it will say, "Missing parameter." It'll say, "Name."

[00:54] Instead of setting a default value for the URL property, we're going to call our required parameter function instead. What will happen is, if our AJAX function is called without a URL property, the required parameter function will be invoked instead resulting in an error exception saying, "Missing parameter URL." Likewise, we could do the same thing for the success property.

[01:17] Now, if we try to call the AJAX function with only the URL property, we should see a missing parameter exception for the success property. If we provide a value for the success property, then we should see all of our parameters logged to the console. By leveraging the default value feature of object destructuring to our advantage, we could provide required parameters as you've seen demonstrated.

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Learn ES6 (ECMAScript 2015)

ES6 Parameter Object Destructuring with Required Values

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