سؤال 59

After result = [1].concat([2]), which statement is correct?

result is [1, 2], and both inputs are unchangedپاسخ درست
the first input becomes [1, 2]
result is the number 2
the second input becomes empty

توضیح

concat returns a new shallow array containing values from both inputs, so result contains 1 and 2 while the input arrays remain unchanged. Claiming that the first input grows confuses combination with a mutating append operation.

توضیح

ادامهٔ این آزمون