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Issue #369  (Object.keys/values, CSS/HTML, Text Editors, React)08/13/20

Previously I discussed the usefulness of the Array.entries() method, which allows you to get an iterator object that holds the key/value pairs for an array. The same thing can be done using Object.entries(), should you require the key/value pairs of a particular object.

Conversely, when working with objects, you may want to get an iterable list of the keys (or property names alone), or just the values. So instead of finagling Object.entries() to strip out one or the other, there's Object.keys() and Object.values() that will do this easily:

let myObj = {
  a: 1,
  b: 'Data',
  c: false

console.log(Object.keys(myObj)); // ["a", "b", "c"] console.log(Object.values(myObj)); // [1, "Data", false]

Try it on CodePen

You pass the object into each one as the only argument and each method returns an array of the items, which is super-useful.

For Object.keys() the property names returned are for the object's own properties that are enumerable. This won't include inherited properties or properties whose name is a Symbol.

With both Object.keys() and Object.values(), the items are collected in the same order as they would be if you looped through them (but these don't access properties in the prototype chain).

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Now on to this week's tools!

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A Tweet for Thought

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