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destructuring nested objects

In the below function, I get the textarea object with the property current. The Issue: ES6 Object Destructuring & Deeply Nested Objects. Nested objects destructuring Destructuring a part of the object The destructuring assignment is a very useful addition to ES6 that allows us to extract values from arrays , or properties from objects , into a bunch of distinct variables. When we have the property, then we can break it into smaller parts by destructuring. Let’s recap. Object destructuring and array destructuring can be combined in a single destructuring assignment. The destructuring assignment syntax is a JavaScript expression that makes it possible to unpack values from arrays, or properties from objects, into distinct variables. But current variable doesn't work. The source for this interactive example is stored in a GitHub repository. This is a huge upside in React when you’re passing down props. Nested Array Destructuring. The object can have nested objects or arrays. Nested Object Destructuring If we look at the first example in this article, we had the employee object with address field that contained nested elements. In the example, I had demonstrated the usage of destructuring through two individual lines of code as shown below: With React, which fully embraces the ES6 syntax, destructuring adds a slew of benefits to improving your code. Nested destructuring. Reasons to destructure Improves readability. Here is a quick example to illustrate this. Here, nested destructuring works with Start and End variables. Obviously this can get pretty messy pretty quickly so feel free to destructure more than once if order to keep your code clean. Just as with objects, you can also do nested destructuring with arrays. This article will go over the basics of destructuring objects and how it applies to props in React. If an object or an array contain other nested objects and arrays, we can use more complex left-side patterns to extract deeper portions. To give you some insight into what I’m describing, let me back up just a minute and go over what object destructuring in JavaScript is, and why it’s a little daunting once your objects get complex. When destructuring nested objects we can destructure them by nesting as the objects or arrays are nested. The corresponding item must be an array in order to use a nested destructuring array literal to assign items in it to local variables. In the code below options has another object in the property size and an array in the property items. Object Destructuring in a Nutshell function someFunction({ current: { selectionStart: Start, selectionEnd: End } }, AppStateSetter) { // do something with current, Start, and End } With Nested Destructuring, you can cherry pick properties to get from as many levels down in your object as you need. Default parameters can also be used with destructuring, ... Just like with arrays, this will only create a shallow copy, and nested objects will still be passed by reference. You saw how to destructure objects (with nested objects), rename variables, assign default values, how destructuring applies to function arguments (and thus to components in React), dynamic destructuring, destructuring arrays, skipping array items and also how to use the rest parameter with both objects and arrays. Destructuring objects and how it applies to props in React example is stored in a repository! A slew of benefits to improving your code object in the below function, get... Interactive example is stored in a GitHub repository corresponding item must be an array contain other nested objects we use. Of destructuring objects and arrays, we can use more complex left-side to. Has another object in the code below options has another object in the items! By destructuring the property, then we can destructure them by nesting as the objects arrays! 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