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var, let & const

var, let, or const — do you actually know when each one is scoped, reassignable, and safe to use? Includes the classic const array-mutation trap.

8 questions · 20 minutes

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var, let & const

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var, let, or const — do you actually know when each one is scoped, reassignable, and safe to use? Includes the classic const array-mutation trap.

8Questions
20 minTime limit
60%Passing score
Unlimited — latest score keptAttempts
Randomized optionsOne at a time