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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

Two Year Club
Writing Debut
One Year Club
4 Week Community Wellness Streak
2 Week Community Wellness Streak
1 Week Community Wellness Streak
4 Week Writing Streak

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Supercharge Your React Projects with Custom Hooks
sergeyleschev profile

Supercharge Your React Projects with Custom Hooks

#webdev #react #javascript #programming
31
Comments 1
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

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React Custom Hook: useTimeout
sergeyleschev profile

React Custom Hook: useTimeout

#webdev #javascript #programming #react
8
Comments 1
2 min read
React Custom Hook: useStorage
sergeyleschev profile

React Custom Hook: useStorage

#webdev #javascript #programming #react
12
Comments 3
2 min read
React Custom Hook: useStateWithValidation
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React Custom Hook: useStateWithValidation

#webdev #javascript #programming #react
7
Comments 1
2 min read
React Custom Hook: useStateWithHistory
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React Custom Hook: useStateWithHistory

#webdev #javascript #programming #react
11
Comments 1
2 min read
React Custom Hook: useScript
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React Custom Hook: useScript

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

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

#webdev #javascript #programming #react
6
Comments 4
2 min read
React Custom Hook: useOnScreen
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React Custom Hook: useOnScreen

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

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

#webdev #javascript #programming #react
8
Comments
2 min read
React Custom Hook: useLongPress
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React Custom Hook: useLongPress

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

#webdev #javascript #programming #react
17
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
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React Custom Hook: useGeolocation

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

#webdev #javascript #programming #react
9
Comments
2 min read
React Custom Hook: useEventListener
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React Custom Hook: useEventListener

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

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

#webdev #javascript #programming #react
6
Comments
2 min read
React Custom Hook: useDebugInformation
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React Custom Hook: useDebugInformation

#webdev #javascript #programming #react
7
Comments
2 min read
React Custom Hook: useDebounce
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React Custom Hook: useDebounce

#webdev #javascript #programming #react
11
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
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React Custom Hook: useDarkMode

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

#webdev #javascript #programming #react
10
Comments
2 min read
React Custom Hook: useCookie
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React Custom Hook: useCookie

#webdev #javascript #programming #react
23
Comments 5
3 min read
React Custom Hook: useClickOutside
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React Custom Hook: useClickOutside

#webdev #javascript #programming #react
10
Comments 4
2 min read
React Custom Hook: useAsync
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React Custom Hook: useAsync

#webdev #javascript #programming #react
13
Comments 2
2 min read
React Custom Hook: useArray
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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.
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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.
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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).
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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.
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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).
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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.
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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.
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Boosting Your Terminal Productivity: Shell GPT.

#webdev #productivity #programming
14
Comments 7
1 min read
LeetCode: 211. Design Add and Search Words Data Structure (and others)
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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.
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Redux-like state container in SwiftUI: Connectors.

#swift #ios #mobile #programming
6
Comments
5 min read
Using Container Views with Redux-like state container
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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.
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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.
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Redux-like state container in SwiftUI. Derived stores.

#swift #ios #mobile #programming
8
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.
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Redux-like state container in SwiftUI. State normalization.

#swift #ios #mobile #programming
8
Comments
2 min read
Redux-like state container in SwiftUI. Usage.
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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
6
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.
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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.
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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.
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Swift: Conforming a protocol to a protocol.

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

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

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

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

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

#swift #mobile #ios #programming
7
Comments
3 min read
KeyPath in Swift: Usage.
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KeyPath in Swift: Usage.

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

#swift #mobile #ios #programming
7
Comments
3 min read
KeyPath in Swift: Syntax.
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KeyPath in Swift: Syntax.

#swift #mobile #ios #programming
8
Comments
3 min read
AnyObject, Any, any: any.
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AnyObject, Any, any: any.

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