Unconventional array presentation

Currently, I am engaged in a Capture the Flag (CTF) competition and encountered a challenge involving JavaScript code which contains the following line:

result[(j * LEN) + i] = bytes[(((j + shifter) * LEN) % bytes.length) + i]

Setting aside the specific variables used, my confusion arises from the fact that an array called results is being assigned a value based on another array. Essentially, what puzzles me is this:

Array[a = b]

I would greatly appreciate it if someone could shed some light on why this operation functions as intended?

javascriptarrays

Answer №1

Your nesting levels are all mixed up.

result[(j * LEN)   + i] = bytes[(((j + shifter) * LEN) % bytes.length) + i]
// The original code above can be simplifed as follows:
result[(j * LEN) + i] = rightHandSide
result[(jTimesLen) + i] = rightHandSide
result[jTimesLenPlusI ] = rightHandSide

It's just a basic assignment to an index within an object or array.

However, arr[a = b] would technically be legal as well, although quite confusing. Assignments work as expressions, so arr[a = b] assigns the value of b to the existing variable a, and then accesses the index b in the array arr (without taking any further action).

a = 3;
b = 5;
arr = [];

arr[a = b];

console.log(a);
console.log(arr);

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