JuniorTheoryCommon

What does the program print (lines separated by spaces)?

KOTLIN

fun main() {
    val a = arrayOf(1, 2)
    val b = arrayOf(1, 2)
    println(a == b)
    println(a.contentEquals(b))
}

false true

Expecting true true: unlike lists, arrays are equal by == only when both names point at one array. a and b are two arrays, so a == b is false.
Expecting contentEquals to look for one shared array: it compares the arrays element by element, so two arrays holding 1, 2 are equal.

JuniorTheoryCommon

KOTLIN

fun main() {
    val a = arrayOf(1, 2)
    val b = arrayOf(1, 2)
    println(a == b)
    println(a.contentEquals(b))
}

false true

Expecting true true: unlike lists, arrays are equal by == only when both names point at one array. a and b are two arrays, so a == b is false.
Expecting contentEquals to look for one shared array: it compares the arrays element by element, so two arrays holding 1, 2 are equal.