Eliding Properties in TypeScript

Eliding Properties in TypeScript

In addition to renaming you sometimes also need to remove properties and merge those changes into a new object.

In addition to renaming you sometimes also need to remove properties and merge those changes into a new object.

In the  previous article we looked at how to rename a property on an object. If you haven’t read that post, it makes for a more logical starting point on this journey.

When you need to use preexisting objects in novel ways, there are always a couple of problematic troublemakers you don’t want to bring on the journey. We’ll dig into properly typing everything in a bit. In the meantime, let’s assume we have a few more properties on our Letters object.

interface with 5 single letter properties: a through d and z

The expanded (from last post) Letters type

This time, we want to not only rename z to zed, but we want to remove both the a and the d properties. Here’s the line of code that does the remove:

fat arrow function that peels off d and a and uses the rest operator to gather and return the other properties

peeling away unneeded properties

typescript javascript software-engineering

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