Today I Learned

Conditionally add properties to objects in Javascript

This comes in handy when you want to completely omit a property from an object in case the value is undefined or null.

{prop1, prop2, ...(condition && prop3)}

The trick being here:

...(condition && prop3)

In case the condition evaluates to false, the property will be completely omitted from the object, otherwise, both the value and its corresponding key will show up in the end result.

Correctly grouping members within modules in JSDoc v3

JSDoc is great! It's documentation not so much. I needed a way to logically group together global methods and I was unsuccessful in finding a straightforward way in its official documentation.

Eventually, I've come across the following method, using @module and @member.

First, we define the module name, usually at the top of the file:

@module MyModule

We then proceed to annotate the target function with @memeber MyModule. One other important aspect is to also include @function along with the name of the function in order to appear in the module section.

 * @member MyModule
 * @function myFunction
 export const myFunction = () => ....

Postman Automatic Auth Token

Postman can run JavaScript commands when executing a request. These commands can be placed in the "Tests" tab inside a request. For example, to automatically set a token as a collection variable, the following commands are used:

var auth = pm.response.headers.get("Authorization");
pm.collectionVariables.set('token', auth.split(" ")[1]);

The Docs regarding Postman scripting can be found here:


Using destructuring assignment to dynamically create new functions in JavaScript

// www.codewars.com/kata/525f3eda17c7cd9f9e000b39

const curry = (operand, operator) => (!operator) ? operand : operator(operand);

const [zero, one, two, three, four, five, six, seven, eight, nine] =
  [0,1,2,3,4,5,6,7,8,9].map(operand => ((operator) => curry(operand, operator)));

const plus = (first) => (second) => second + first;
const minus = (first) => (second) => second - first;
const times = (first) => (second) => second * first;
const dividedBy = (first) => (second) => Math.floor(second / first);