BFE.dev 159 promisify() | JSer - Front-End Interview questions

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promisify() is some old topic and this problem is very easy.

Hi I'm a JavaScript engineer who is not good at algorithms,
and currently practicing leetCode & BFE.dev. If you are interested, maybe we can learn together.
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I love your videos, JSer is the man. Btw, would you explain what happened to 'this' when you use arrow function and why do you have to use call?

petechen
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Hey Your channel content is awesome 👌 keep up the good work 👏

rajaj
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I'll have to watch it again and again, I wouldn't be able to get to this answer alone :(

CaioCodes