How to use multiple methods in JavaScript at the same time

Question

I have an input where you can search for a specific course by its name, for this I use filtering, and also the includes() method, my problem is that I need to apply three methods at the same time, the first method is toLowerCase(), the second is toUpperCase() and the last method is trim()

GetMyCourses() {
  return this.courses.filter(value => {
    return value.title.toLowerCase().includes(this.result);
  });
},

If you leave the toLowerCase method, then it does not give capital names when searching, and vice versa, in addition, if you remove these two methods, then when searching you will need to accurately search for the word

You could do this with array some, but here you certainly don't need it. It's like the answer says — Estus Flask
– Estus Flask, Commented Oct 16, 2021 at 21:03
How to use multiple methods in JavaScript at the same time use regex, .filter(value => new RegExp(search, "i").test(value.title)), search being something you made safe or built from some logic playcode.io/823069 — Lawrence Cherone
– Lawrence Cherone, Commented Oct 16, 2021 at 21:12

Barmar · Accepted Answer · 2021-10-16 21:00:31Z

4

Convert this.result to lower case as well.

GetMyCourses() {
  let result = this.result.toLowerCase()
  return this.courses.filter(value => {
    return value.title.toLowerCase().includes(result);
  });
},

answered Oct 16, 2021 at 21:00

Barmar

789k57 gold badges555 silver badges669 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Heretic Monkey Over a year ago

Or just value.title.toLowerCase().includes(this.result.toLowerCase())...

Barmar Over a year ago

@HereticMonkey Yeah, but that converts this.result multiple times unnecessarily.

Heretic Monkey Over a year ago

Meh. 99% of the time that's not going to be a problem. If you want to micro-optimize, you should have a value.searchableTitle property that is already lower-cased...

Barmar Over a year ago

I also like to do it just to keep the expression less complex.

Collectives™ on Stack Overflow

How to use multiple methods in JavaScript at the same time

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related