Build lodash.omit from Scratch with forEach and for...in

Instructor: [0:00] In a file called omit.js, type function omit and pass in two arguments, obj and keys. The first thing that we're going to do inside this function is create a shallow copy of our object by typing const result = object.assign(emptyObject, obj). We'll return that result.

[0:23] Just before our return, let's loop through our keys by typing keys.forEach(key). For each one of those keys, delete result key. We start by copying the object, then we go through each of the keys we don't want to in our object and delete them from the result. Pretty straightforward.

[0:43] Let's create a second event function, this time called omit to. We'll take the same arguments, obj and keys. Inside of that, we'll create an empty object for result and return the result. Right before our return statement, type for (let key in obj). Then, if not keys.includes(key) results(key) = (obj, key).

[1:08] For each of the keys in our object, we're going to loop through those. If the key that we're currently looping through is not included in the list of keys, then we'll go ahead and copy that over into our result object.

[1:22] To prove that this works, I've got an object here with a few letters from the alphabet. We'll test against that by typing console.log(omit(obj)) and we'll pass in the array B, C, D. We will do the same thing down here for omit to. Let's run that, node./omit.js and we're seeing exactly right. Only the A and E keys remain.