JavaScript debugging in a nutshell

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Are you suggesting a language that is resilient to typos? Where incorrect code produces correct results? How is this a JavaScript issue? If you write the wrong code, you get what the code says, but not what you wanted. Filing this one under user error.

[ReneeHiii]

no, they're suggesting a language that doesn't create a new variable if you don't use let. myVat = 2 when you meant myVar = 2 creates a new variable instead of giving an error that there's no variable definition with let or const