November 6, 2023
Understanding division and the modulus operator
To start with integer division in js, you need to understand the standard division (
/) operator and the modulus operator (
%). The division operator returns a floating-point result, while the modulus operator returns the remainder of a division.
Math.floor() to achieve integer division
One way to perform integer division is to use the
Math.floor() function, which rounds down to the nearest integer:
Math.trunc() for positive dividends
For positive numbers,
Math.trunc() can be used as it simply truncates the fractional part, giving the integer quotient:
Bitwise OR for fast integer division
Utilizing the double NOT bitwise operator
The double NOT bitwise operator
~~ can also be used to floor the division result, similar to using a single
Dealing with negative numbers
For negative dividends, special attention is needed as different methods round in different directions:
Choose the method that aligns with the rounding direction required for your use case.
parseInt() for integer division
While typically used for string conversion,
parseInt() can perform integer division by parsing the result of the division to an integer:
This method is best used when the intention is clear and parsing a numerical result is understood in context.
Handling numbers beyond 32-bit integer range
For operations on large numbers beyond the 32-bit integer range, bitwise operators may not be suitable:
In such cases, methods like
Math.trunc() are safer alternatives.
Practical use case: Pagination
Integer division can be practically applied in scenarios like pagination:
Precision in calculations
Performance-critical applications may benefit from the faster operation of bitwise operators:
Division by zero
Ensure to handle cases of division by zero to avoid logical errors in your code:
It's important to manage this case appropriately, possibly by implementing error checking or default values.
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