Typescript Restructuring Assignments

Destructuring

TypeScript supports the following forms of Destructuring (literally named after de-structuring i.e. breaking up the structure):

  1. Object Destructuring
  2. Array Destructuring

It is easy to think of destructuring as an inverse of structuring. The method of structuring in JavaScript is the object literal:

Without the awesome structuring support built into JavaScript, creating new objects on the fly would indeed be very cumbersome. Destructuring brings the same level of convenience to getting data out of a structure.

Object Destructuring

Destructuring is useful because it allows you to do in a single line, what would otherwise require multiple lines. Consider the following case:

Here in the absence of destructuring you would have to pick off one by one from .

To assign an extracted variable to a new variable name you can do the following:

Additionally you can get deep data out of a structure using destructuring. This is shown in the following example:

Object Destructuring with rest

You can pick up any number of elements from the an object and get an object of the remaining elements using object destructuring with rest.

A common use case is also to ignore certain properties. For example:

Array Destructuring

A common programming question: "How to swap two variables without using a third one?". The TypeScript solution:

Note that array destructuring is effectively the compiler doing the and so on for you. There is no guarantee that these values will exist.

Array Destructuring with rest

You can pick up any number of elements from the array and get an array of the remaining elements using array destructuring with rest.

Array Destructuring with ignores

You can ignore any index by simply leaving its location empty i.e. in the left hand side of the assignment. For example:

JS Generation

The JavaScript generation for non ES6 targets simply involves creating temporary variables, just like you would have to do yourself without native language support for destructuring e.g.

Summary

Destructuring can make your code more readable and maintainable by reducing the line count and making the intent clear. Array destructuring can allow you to use arrays as though they were tuples.


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