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jser

practicing frontend coding problems

Location Tokyo Joined Joined on  Personal website https://jser.dev twitter website
How does useImperativeHandle() work? - React source code walkthrough

How does useImperativeHandle() work? - React source code walkthrough

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BFE.dev #34. implement `Promise.any()`

BFE.dev #34. implement `Promise.any()`

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BFE.dev #8. can you shuffle() an array?

BFE.dev #8. can you shuffle() an array?

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2 min read
create a Modal System with Context API in React

create a Modal System with Context API in React

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1 min read
BFE.dev #55. highlight keywords in HTML string

BFE.dev #55. highlight keywords in HTML string

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BFE.dev #20. Detect data type in JavaScript

BFE.dev #20. Detect data type in JavaScript

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BFE.dev #104. Traverse DOM level by level

BFE.dev #104. Traverse DOM level by level

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BFE.dev #33. implement Promise.allSettled()

BFE.dev #33. implement Promise.allSettled()

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BFE.dev #107. Find the largest difference

BFE.dev #107. Find the largest difference

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BFE.dev #23. create a sum()

BFE.dev #23. create a sum()

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BFE.dev #9. decode message

BFE.dev #9. decode message

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BFE.dev #32. implement `Promise.all()`

BFE.dev #32. implement `Promise.all()`

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2 min read
BFE.dev challenge #108. Implement a Stack by using Queue

BFE.dev challenge #108. Implement a Stack by using Queue

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BFE.dev challenge #13. Implement a Queue by using Stack

BFE.dev challenge #13. Implement a Queue by using Stack

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BFE.dev challenge #58. get DOM tree height

BFE.dev challenge #58. get DOM tree height

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BFE.dev challenge #11. what is Composition? create a pipe()

BFE.dev challenge #11. what is Composition? create a pipe()

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BFE.dev challenge #64 auto-retry Promise on rejection

BFE.dev challenge #64 auto-retry Promise on rejection

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1 min read
How to detect infinite loops in JavaScript?

How to detect infinite loops in JavaScript?

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BFE coding challenge #3 implement Array.prototype.flat()

BFE coding challenge #3 implement Array.prototype.flat()

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BFE.dev challenge #88 support negative Array index in JavaScript

BFE.dev challenge #88 support negative Array index in JavaScript

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BFE.dev coding #2 implement curry() with placeholder support

BFE.dev coding #2 implement curry() with placeholder support

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BFE coding challenge #1 implement curry()

BFE coding challenge #1 implement curry()

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1 min read
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