Need help understanding strange array syntax

Question

I found this bit in a book and I don\'t get what it does:

int index = 1;
...
getArray() [index=2]++;

[index=2]++; looks strange to me,

Answer 1

Let's break that code:

getArray() [index=2]++;

is equivalent to:

int[] someArray = getArray();  // Assume that's an int[]
index = 2;
someArray[index]++;

The last line is equivalent to:

someArray[index] = someArray[index] + 1;

If you remove that ++, then the 2nd expression is not a valid statement. It just becomes:

getArray() [index];

You have to assign that to some L-Value.