I want to search collection in typescript as we can search in SQL and linq with like operator in sql and contain method in linq i.e in sql

name like ‘%searchString%’

and in linq

query = query.Where(x => x.UserName.ToLower().Contains(queryObj.SearchStr.ToLower()));

Is there a way we can do this operation in typescript? To search a collection of strings for items with partial match?

Thank you

I want to search collection in typescript as we can search in SQL and linq with like operator in sql and contain method in linq i.e in sql

name like ‘%searchString%’

and in linq

query = query.Where(x => x.UserName.ToLower().Contains(queryObj.SearchStr.ToLower()));

Is there a way we can do this operation in typescript? To search a collection of strings for items with partial match?

Thank you

• javascript
• angular
• typescript
• linq
• asp-core

Share Improve this question Follow edited Apr 21, 2020 at 18:22 Arghya C 10.1k44 gold badges4949 silver badges6969 bronze badges asked Apr 21, 2020 at 18:02 user2825468user2825468 6311 silver badge88 bronze badges 10

• can you provide sample data ? – rksh1997 Commented Apr 21, 2020 at 18:03
• You may consider any type of data in collection – user2825468 Commented Apr 21, 2020 at 18:05
• 1 String.prototype.includes() might be what you're looking for query.filter(e => e.includes("searchString")). developer.mozilla/en-US/docs/Web/JavaScript/Reference/… – Jason White Commented Apr 21, 2020 at 18:08
• filter should work – Arghya C Commented Apr 21, 2020 at 18:08
• 1 @Arghya C, filter with include is working well, thank you – user2825468 Commented Apr 21, 2020 at 18:17

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4 Answers 4

Sorted by: Reset to default 3

Use the Javascript filter array function. filter returns the items in an array where the expression evaluates to a truthy result.

You can use the includes string function to see if a string exists inside another string.

const values = [
  'abc',
  'aYz',
  'xyz'
];

const filtered = values.filter(x => x.toLocaleLowerCase().includes('y'));

console.log(filtered);

const arr: string[] = ['paris', 'berlin', 'delhi', 'istanbul'];

const result: string[] = arr.filter(key => key.toLowerCase().includes('in'));

To find one value. The result isn't an array here. It returns berlin.

const values = ['paris', 'berlin', 'delhi', 'istanbul'];

const filtered = values.find(x => x.toLocaleLowerCase().includes('in'));

console.log(filtered);

Linq:

query = query.Where(x => x.UserName.ToLower().Contains(queryObj.SearchStr.ToLower()));

TypeScript/JavaScript

query = query.filter(x => x.userName.toLowerCase().includes(queryObj.SearchStr.toLowerCase()))