What does console.log(JSON.stringify(rest)) print? JavaScript Arrays and Iteration

Answer, A. [2,3,4]

A. [2,3,4]

Correct. first takes the initial element, 1, and the rest pattern collects everything that remains afterward into a new array, 2, 3 and 4.

B. [1,2,3,4]

Assumes the rest pattern collects the entire original array alongside the named binding. The rest pattern only collects whatever elements are left over after the earlier named bindings have taken their share.

C. [3,4]

Drops one extra element from the front, as if two positions were named instead of one. Only first is named here, so rest correctly starts collecting from the second element onward.

D. [1]

Swaps the roles, as if the rest pattern captured only what first took. first binds to a single value taken from the front, while rest always collects everything that remains after it.

A rest element in a destructuring pattern must come last, and it gathers every remaining value that was not already claimed by an earlier named binding into a genuine new array. This mirrors rest parameters in function definitions, which collect any extra arguments beyond the named ones.