What will the output of console.log([1, 2][0]); be?

The output of console.log([1, 2][0]); will be 1. This result occurs because the expression [1, 2] creates an array containing two elements: the number 1 in the first position (index 0) and the number 2 in the second position (index 1). When you access an element of an array in JavaScript, you use square brackets with the index of the element you wish to access. Since the index for the first element of the array is 0, using [0] retrieves the first element, which is 1. Therefore, when you log this value to the console, it outputs 1.