DEV Community

Sergey Leschev profile picture

Sergey Leschev

Team Lead (Swift, TypeScript, SQL). LeetCode Ranking #Dev TOP 200 Global. Google Engineering Level: L7+

Joined Joined on  Email address sergey.leschev@gmail.com Personal website https://github.com/sergeyleschev github website twitter website

Education

Computer science

Work

System Architect | Team Lead | CTO

Pin Pinned

Supercharge Your React Projects with Custom Hooks
sergeyleschev profile

Supercharge Your React Projects with Custom Hooks

#webdev #react #javascript #programming
31
Comments
39 min read
LeetCode, Hard (Acceptance 24%, Latest): 2867. Count Valid Paths in a Tree. DFS. O(n). Swift.
sergeyleschev profile

LeetCode, Hard (Acceptance 24%, Latest): 2867. Count Valid Paths in a Tree. DFS. O(n). Swift.

#swift #ios #programming #algorithms
12
Comments 1
3 min read

Want to connect with Sergey Leschev?

Create an account to connect with Sergey Leschev. You can also sign in below to proceed if you already have an account.

Create Account
Already have an account? Sign in
React Custom Hook: useTimeout
sergeyleschev profile

React Custom Hook: useTimeout

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useStorage
sergeyleschev profile

React Custom Hook: useStorage

#webdev #javascript #programming #react
14
Comments 2
2 min read
React Custom Hook: useStateWithValidation
sergeyleschev profile

React Custom Hook: useStateWithValidation

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useStateWithHistory
sergeyleschev profile

React Custom Hook: useStateWithHistory

#webdev #javascript #programming #react
11
Comments
2 min read
React Custom Hook: useScript
sergeyleschev profile

React Custom Hook: useScript

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useRenderCount
sergeyleschev profile

React Custom Hook: useRenderCount

#webdev #javascript #programming #react
6
Comments
2 min read
React Custom Hook: usePrevious
sergeyleschev profile

React Custom Hook: usePrevious

#webdev #javascript #programming #react
8
Comments 4
2 min read
React Custom Hook: useOnScreen
sergeyleschev profile

React Custom Hook: useOnScreen

#webdev #javascript #programming #react
12
Comments 3
2 min read
React Custom Hook: useOnlineStatus
sergeyleschev profile

React Custom Hook: useOnlineStatus

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useMediaQuery
sergeyleschev profile

React Custom Hook: useMediaQuery

#webdev #javascript #programming #react
9
Comments
2 min read
React Custom Hook: useLongPress
sergeyleschev profile

React Custom Hook: useLongPress

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useHover
sergeyleschev profile

React Custom Hook: useHover

#webdev #javascript #programming #react
16
Comments 16
2 min read
LeetCode, Hard: 2818. Apply Operations to Maximize Score. Swift
sergeyleschev profile

LeetCode, Hard: 2818. Apply Operations to Maximize Score. Swift

#swift #ios #programming #algorithms
6
Comments
5 min read
React Custom Hook: useGeolocation
sergeyleschev profile

React Custom Hook: useGeolocation

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useFetch
sergeyleschev profile

React Custom Hook: useFetch

#webdev #javascript #programming #react
11
Comments
2 min read
React Custom Hook: useEventListener
sergeyleschev profile

React Custom Hook: useEventListener

#webdev #javascript #programming #react
9
Comments
2 min read
React Custom Hook: useEffectOnce
sergeyleschev profile

React Custom Hook: useEffectOnce

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useDeepCompareEffect
sergeyleschev profile

React Custom Hook: useDeepCompareEffect

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useDebugInformation
sergeyleschev profile

React Custom Hook: useDebugInformation

#webdev #javascript #programming #react
9
Comments
2 min read
React Custom Hook: useDebounce
sergeyleschev profile

React Custom Hook: useDebounce

#webdev #javascript #programming #react
14
Comments 2
2 min read
LeetCode, Hard, last two problems: 2809. Min Time to Make Array Sum At Most x & 2813. Max Elegance of a K-Length Subseq.
sergeyleschev profile

LeetCode, Hard, last two problems: 2809. Min Time to Make Array Sum At Most x & 2813. Max Elegance of a K-Length Subseq.

#swift #ios #programming #algorithms
7
Comments 2
4 min read
React Custom Hook: useDarkMode
sergeyleschev profile

React Custom Hook: useDarkMode

#webdev #javascript #programming #react
14
Comments 4
2 min read
React Custom Hook: useCopyToClipboard
sergeyleschev profile

React Custom Hook: useCopyToClipboard

#webdev #javascript #programming #react
14
Comments
2 min read
React Custom Hook: useCookie
sergeyleschev profile

React Custom Hook: useCookie

#webdev #javascript #programming #react
17
Comments 5
3 min read
React Custom Hook: useClickOutside
sergeyleschev profile

React Custom Hook: useClickOutside

#webdev #javascript #programming #react
12
Comments 4
2 min read
React Custom Hook: useAsync
sergeyleschev profile

React Custom Hook: useAsync

#webdev #javascript #programming #react
17
Comments 2
2 min read
React Custom Hook: useArray
sergeyleschev profile

React Custom Hook: useArray

#webdev #javascript #programming #react
27
Comments 11
2 min read
LeetCode 2532 (Hard++, Extra Category, Amazon). Time to Cross a Bridge.
sergeyleschev profile

LeetCode 2532 (Hard++, Extra Category, Amazon). Time to Cross a Bridge.

#swift #ios #programming #algorithms
7
Comments 4
6 min read
iOS Dev Skills. Performance Review.
sergeyleschev profile

iOS Dev Skills. Performance Review.

#ios #mobile #programming #management
7
Comments
4 min read
LeetCode 2801 (Hard, Acceptance Level 14.5%). Count Stepping Numbers in Range. DP. Efficiently handles large inputs (10^9 + 7).
sergeyleschev profile

LeetCode 2801 (Hard, Acceptance Level 14.5%). Count Stepping Numbers in Range. DP. Efficiently handles large inputs (10^9 + 7).

#swift #ios #programming #algorithms
7
Comments 2
4 min read
LeetCode 2790 (Hard). Maximum Number of Groups With Increasing Length. O(NlogN). Math. Only 10 lines of code.
sergeyleschev profile

LeetCode 2790 (Hard). Maximum Number of Groups With Increasing Length. O(NlogN). Math. Only 10 lines of code.

#swift #ios #programming #algorithms
5
Comments
4 min read
LeetCode 2612 (Hard). Minimum Reverse Operations. Swift. BFS. O(n+k). O(n).
sergeyleschev profile

LeetCode 2612 (Hard). Minimum Reverse Operations. Swift. BFS. O(n+k). O(n).

#swift #ios #programming #algorithms
8
Comments
4 min read
LeetCode 956 (Hard). Solution of the day. Tallest Billboard. Swift. DP.
sergeyleschev profile

LeetCode 956 (Hard). Solution of the day. Tallest Billboard. Swift. DP.

#swift #ios #programming #algorithms
6
Comments 1
3 min read
Boosting Your Terminal Productivity: Shell GPT.
sergeyleschev profile

Boosting Your Terminal Productivity: Shell GPT.

#webdev #productivity #programming
13
Comments 7
1 min read
LeetCode: 211. Design Add and Search Words Data Structure (and others)
sergeyleschev profile

LeetCode: 211. Design Add and Search Words Data Structure (and others)

#algorithms #swift #mobile
5
Comments
1 min read
Redux-like state container in SwiftUI: Connectors.
sergeyleschev profile

Redux-like state container in SwiftUI: Connectors.

#swift #ios #mobile #programming
6
Comments
5 min read
Using Container Views with Redux-like state container
sergeyleschev profile

Using Container Views with Redux-like state container

#swift #ios #mobile #programming
6
Comments 2
2 min read
Redux-like state container in SwiftUI. Container Views.
sergeyleschev profile

Redux-like state container in SwiftUI. Container Views.

#swift #ios #mobile #programming
6
Comments
2 min read
Redux-like state container in SwiftUI. Derived stores.
sergeyleschev profile

Redux-like state container in SwiftUI. Derived stores.

#swift #ios #mobile #programming
7
Comments
2 min read
Redux-like state container in SwiftUI. Reducer composition.
sergeyleschev profile

Redux-like state container in SwiftUI. Reducer composition.

#swift #ios #mobile #programming
8
Comments
2 min read
Redux-like state container in SwiftUI. State composition.
sergeyleschev profile

Redux-like state container in SwiftUI. State composition.

#swift #ios #mobile #programming
6
Comments
2 min read
Redux-like state container in SwiftUI. State normalization.
sergeyleschev profile

Redux-like state container in SwiftUI. State normalization.

#swift #ios #mobile #programming
8
Comments
2 min read
Redux-like state container in SwiftUI. Usage.
sergeyleschev profile

Redux-like state container in SwiftUI. Usage.

#swift #ios #mobile #programming
6
Comments
2 min read
Redux-like state container in SwiftUI. Side effects.
sergeyleschev profile

Redux-like state container in SwiftUI. Side effects.

#swift #ios #mobile #programming
6
Comments 2
2 min read
Redux-like state container in SwiftUI. Unidirectional flow.
sergeyleschev profile

Redux-like state container in SwiftUI. Unidirectional flow.

#swift #ios #mobile #programming
5
Comments
2 min read
Redux-like state container in SwiftUI. Reducer and Actions.
sergeyleschev profile

Redux-like state container in SwiftUI. Reducer and Actions.

#swift #ios #mobile #programming
5
Comments
2 min read
Redux-like state container in SwiftUI. Basics.
sergeyleschev profile

Redux-like state container in SwiftUI. Basics.

#swift #ios #mobile #programming
5
Comments
2 min read
SwiftUI & ChatGPT. The world is changing. Again.
sergeyleschev profile

SwiftUI & ChatGPT. The world is changing. Again.

#swift #ios #mobile #programming
6
Comments
5 min read
Swift 5.7: Regex. Shorthands for optional unwrapping. Unlock existentials for all protocols.
sergeyleschev profile

Swift 5.7: Regex. Shorthands for optional unwrapping. Unlock existentials for all protocols.

#swift #ios #mobile #programming
10
Comments 1
2 min read
Swift: Conforming a protocol to a protocol.
sergeyleschev profile

Swift: Conforming a protocol to a protocol.

#swift #ios #mobile #programming
5
Comments
2 min read
Swift: Associated types. Constraints.
sergeyleschev profile

Swift: Associated types. Constraints.

#swift #ios #mobile #programming
6
Comments
2 min read
Swift: Associated types. Example.
sergeyleschev profile

Swift: Associated types. Example.

#swift #ios #mobile #programming
5
Comments
2 min read
Swift: Associated types. Declaration.
sergeyleschev profile

Swift: Associated types. Declaration.

#swift #ios #mobile #programming
5
Comments
2 min read
Swift: Associated types.
sergeyleschev profile

Swift: Associated types.

#swift #mobile #ios #programming
5
Comments
2 min read
Array of weak in Swift.
sergeyleschev profile

Array of weak in Swift.

#swift #mobile #ios #programming
6
Comments
3 min read
KeyPath in Swift: Usage.
sergeyleschev profile

KeyPath in Swift: Usage.

#swift #mobile #ios #programming
5
Comments
5 min read
Types of KeyPath in Swift.
sergeyleschev profile

Types of KeyPath in Swift.

#swift #mobile #ios #programming
6
Comments
3 min read
KeyPath in Swift: Syntax.
sergeyleschev profile

KeyPath in Swift: Syntax.

#swift #mobile #ios #programming
6
Comments
3 min read
AnyObject, Any, any: any.
sergeyleschev profile

AnyObject, Any, any: any.

#swift #ios #programming #mobile
7
Comments
2 min read
loading...