They asked differences between let, const, and var, concepts of closures, and a small coding round. Coding included frequency counter problems like finding how many times elements appeared in an array or arranging an array based on type and returning an object.

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Sigiloso · Accepted Answer

var is function-scoped and allows redeclaration, let and const are block-scoped. let allows reassignment, while const does not.
closure is when a function remembers its lexical scope even if executed outside of it. It’s often used for data privacy and maintaining state.

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