One Pager Cheat Sheet

• We usually represent numbers in decimal notation (Base 10), while computers prefer binary numbers (Base 2) represented by a sequence of ones and zeros, where each bit represents a power of decimal 2.
• Because of its convenience for logic circuits and its use for bitwise operations in programming, binary is the basis for all modern computer hardware and software.
• Javascript supports 7 bitwise operators; the four bitwise logical operators, &, |, ^, and ~, and the three bitwise shift operators, <<, >>, and >>>, which allow binary values to be manipulated and converted to decimal numbers.
• Bitwise operators &, |, ^, and ~ manipulate the bits of their operands and the resulting bits are converted back to a decimal form.
• Bitwise shift operators in JavaScript shift bits left or right by a predetermined number of bit positions, and the choice of operator determines whether the leftmost bit defines the sign of the number or it is filled with zeros.
• Despite some common use cases in image editing, motion graphics, data compression and encryption, device drivers, and embedded programming, direct bit manipulation is not a common industry practice, and should only be used if it brings added value.
• The left shift operator (<<) shifts the binary sequence of a number to the left, potentially changing its sign.
• Answer this interview question with efficiency by using Bitwise Operators in the XOR swap algorithm.
• You can use Bitwise AND to quickly check if an integer x is even or odd without using division: x & 1 will return 1 if the integer is odd, and 0 if it's even.
• Shifting n digits to the left is equivalent to multiplying by 2, which is achieved by binary multiplication of x multiplied by 2 to the power n.
• Check if a positive integer is a power of 2 without branching by subtracting 1 from it and performing a Bitwise AND operation.
• The XOR bitwise operator compares each bit of two integers, returning 1 if they are different and 0 if they are the same, allowing for the detection of opposite signs and being symmetric regardless of the order of the two numbers being compared.
• Learn more about bitwise operators and their usage in real-world scenarios by exploring these resources.