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[yeana29]

what does the left shift operator do in JavaScript?

In JavaScript, the left shift (<<) operator is a bitwise operator that shifts the bits of a number to the left by a specified number of positions. Each left shift effectively multiplies the number by 2 to the power of the shift amount. It's important to note that the left shift operator only works with integer values.

The syntax for the left shift operator is:

result = num << shiftAmount;

Here's an example:

let num = 5; // Binary representation: 00000101

let shifted = num << 2; // Shifting 2 positions to the left

console.log(shifted); // Output: 20 (Binary representation: 00010100)

Explanation:

The binary representation of 5 is 00000101.

Shifting 5 two positions to the left results in 00010100, which is 20 in decimal.

Keep in mind that left shifting can cause numbers to overflow if the leftmost bits are shifted out of the range that can be represented. It's also important to remember that left shifting negative numbers can lead to unexpected results due to the way negative numbers are represented in binary using two's complement.

In most cases, the left shift operator is used in low-level operations involving binary manipulation and bitwise calculations. It's not as commonly used in high-level JavaScript programming compared to other operations.

-Answer by Chatgpt

[yeana29]

how to convert binary to decimal ?

To convert a binary number to its decimal equivalent, you can use the following method:

Start from the rightmost digit of the binary number.

For each digit, multiply its value by 2 raised to the power of its position (starting from 0 for the rightmost digit).

Sum up the results of the multiplications.

For example, let's convert the binary number 10101 to decimal:Binary: 1 0 1 0 1 Position: 4 3 2 1 0 Decimal = (1 * 2^4) + (0 * 2^3) + (1 * 2^2) + (0 * 2^1) + (1 * 2^0) Decimal = 16 + 0 + 4 + 0 + 1 Decimal = 21

So, the binary number 10101 is equivalent to the decimal number 21.

You can also use built-in JavaScript functions to perform the conversion:const binaryNumber = "10101"; const decimalNumber = parseInt(binaryNumber, 2); console.log(decimalNumber); // Output: 21

The parseInt() function with the second argument 2 tells JavaScript that the input is in base-2 (binary), and it will return the equivalent decimal value.

-Answer by Chatgpt