Javascript Check if part of string is contained in enum values

Question

I have an enum

 enum YourEnum {
   enum1 = 'Sunday',
   enum2 = 'Monday',
   enum3 = 'Tuesday',
}

and I want to check if some part of word are included in. If for example user tips "mon", i'm expecting that it matches with Monday.

I have two problems: I need to convert values of enum in lowercase, and I need that part of word match.

I tried to do that:

var value = "mon";
if (Object.values(YourEnum).toString().toLowerCase().includes((value))) {
    console.log("some values match")
}

or

const list=Object.values(YourEnum).toString().toLowerCase();
for (let i = 0; i < list.length; i++){
    if (list[i].indexOf("mon") >= 0){
        console.log("some values match", list[i]);
     }
}

But I don't get the results I'm expecting.

Any ideas ?

Do you need to convert them to lower case permanently or only for the search purpose? — Randy Casburn
– Randy Casburn, Commented Nov 18, 2020 at 0:27

CRice · Accepted Answer · 2020-11-17 23:33:16Z

2

Are you trying to find which item of the enum your search string is matching against? In that case try using the array .find method to check each enum member for a match, returning the first that does:

/*
enum YourEnum {
   enum1 = 'Sunday',
   enum2 = 'Monday',
   enum3 = 'Tuesday',
}
*/

// This is how a typescript enum is transpiled, it is equivalent to the typescript code above.
var YourEnum;
(function(YourEnum) {
  YourEnum["enum1"] = "Sunday";
  YourEnum["enum2"] = "Monday";
  YourEnum["enum3"] = "Tuesday";
})(YourEnum || (YourEnum = {}));

// Here is an example of how it might be done.
const findMatchingDay = search_str =>
  Object.values(YourEnum).find(day => day.toLowerCase().includes(search_str));

console.log(findMatchingDay("mon"));
console.log(findMatchingDay("not_a_day"));

answered Nov 17, 2020 at 23:33

CRice

32.6k5 gold badges63 silver badges75 bronze badges

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

Comments

Paul Braganza · Accepted Answer · 2020-11-17 23:48:24Z

1

const list=Object.values(YourEnum).toString().toLowerCase();

When you use above line of code its converting the list to a string

"sunday,monday,tuesday"

You can use the below script to get expected results

const list=Object.values(YourEnum);

for (let i = 0; i < list.length; i++){
    if (list[i].toString().toLowerCase().indexOf("mon")>=0){
        console.log("some values match", list[i]);
     }
}

answered Nov 17, 2020 at 23:48

Paul Braganza

1511 silver badge7 bronze badges

Comments

Randy Casburn · Accepted Answer · 2020-11-18 00:33:37Z

0

This code will find the search by filtering the enum for lowercase versions of the enum. Note that StackSnippets doesn't like enum keyword due to babel, so had to include link to TS Playground snippet.

Object.values returns an array that you can use filter on to filter out everything that does not contain the test.

const test: string = 'mon';

enum YourEnum {
   enum1 = 'Sunday',
   enum2 = 'Monday',
   enum3 = 'Tuesday',
}

const out = Object.values(YourEnum).filter(value=>value.toLowerCase().includes(test));
console.log(out);

TS Playground

answered Nov 18, 2020 at 0:33

Randy Casburn

14.2k1 gold badge19 silver badges32 bronze badges

Collectives™ on Stack Overflow

Javascript Check if part of string is contained in enum values

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related