Lua:bAnd

<> Function function bAnd(int1, int2) : Integer

Performs a bitwise AND operation between two integer values. This function behaves the same as Lua's bitwise AND operator (&) in Cheat Engine. It is commonly used to check whether specific bits are set or to filter bitmask values.

Function Parameters

Parameter	Type	Description
int1	integer	The first integer value used in the bitwise AND operation.
int2	integer	The second integer value used in the bitwise AND operation.

Returns

An integer representing the result of the bitwise AND operation.

Description

The bitwise AND operation compares each bit of the two integers and sets the bit in the result to 1 only if both bits are 1. This is often used for:

• Checking whether a specific flag is enabled
• Filtering unwanted bits
• Performing masked comparisons

Binary example:

1101   (13)
0101   (5)
----
0101   (5)

Usage Examples

Simple bitwise AND:

print( bAnd(13, 5) )   -- 5

Using Lua's AND operator (equivalent):

print( 13 & 5 )        -- 5

Checking if a specific flag is set:

local FLAGS = 0x0D   -- 1101
local CHECK = 0x04   -- 0100

if bAnd(FLAGS, CHECK) ~= 0 then
  print("Flag is set!")
end

Clearing bits using AND with a mask:

local value = 0x0F      -- 1111
local mask  = 0xF0      -- clears lower bits
local result = bAnd(value, mask)
print(string.format("0x%X", result))

Behavior

• Returns an integer value.
• Only works on numeric inputs.
• Equivalent to Lua's native bitwise AND operator (&) in Cheat Engine.
• Commonly used for feature flags, filtering, and masked logic.

Advanced Examples

Extracting a subset of bits (bitmask extraction):

local value = 0x3A   -- 00111010
local mask  = 0x0F   -- 00001111
local lowerNibble = bAnd(value, mask)
print(string.format("Lower nibble: %X", lowerNibble))

Checking multiple flags:

local flags = 0x37   -- 110111
local needed = 0x21  -- 100001

if bAnd(flags, needed) == needed then
  print("All required flags are set")
end

See also

Lua

Script Engine

Related Functions

bOr – Bitwise OR

bXor – Bitwise XOR

bAnd – Bitwise AND

bShl – Bitwise Shift Left

bShr – Bitwise Shift Right

bNot – Bitwise NOT