Answer would be option 1. Let us dry run it.

Iteration 1:

--- x = 1 ---
y = --x; // y = 0 and x = 0
console.log(x++ + --y) // (0 + (-1)) = -1, and x = 1 now
while(x++ &lt; 5) // (1 &lt; 5) is true, and x = 2 now

Next Iteration:

--- x = 2 ---
y = --x; // y = 1 and x = 1
console.log(x++ + --y) // (1 + 0) = 1, and x = 2 now
while(x++ &lt; 5) // (2 &lt; 5) is true, and x = 3 now

Next Iteration:

--- x = 3 ---
y = --x; // y = 2 and x = 2
console.log(x++ + --y) // (2 + 1) = 3, and x = 3 now
while(x++ &lt; 5) // (3 &lt; 5) is true, and x = 4 now

Next Iteration:

--- x = 4 ---
y = --x; // y = 3 and x = 3
console.log(x++ + --y) // (3 + 2) = 5, and x = 4 now
while(x++ &lt; 5) // (4 &lt; 5) is true, and x = 5 now

Next Iteration:

--- x = 5 ---
y = --x; // y = 4 and x = 4
console.log(x++ + --y) // (4 + 3) = 7, and x = 5 now
while(x++ &lt; 5) // (5 &lt; 5) is false, and loop breaks

Answer: -1 1 3 5 7

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