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Is there a reason why making use of "globals" is discouraged in JS?

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Hello, I was reading a bit about

Number.parseInt()

Number.parseInt()

parseInt()

parseInt()

. Then I encounted something like what

parseInt()

parseInt()

is a global function and

Number.parseInt()

Number.parseInt()

would be the preferred way to convert a string to a number.

Can someone explain why pls. Also... why using global isn't a good thing?

Is there a reason why making use of "globals" is discouraged in JS? - Kevin Powell - Community