The tilde(~) operator: the secret weapon for efficient integer conversion

aniketcodes — Tue, 20 Dec 2022 05:15:02 +0000

In JavaScript, the tilde (~) is a bitwise NOT operator. It performs a bitwise NOT operation on its operand, which inverts the bits of the operand.

For example:

let x = 5;  // 00000000000000000000000000000101
let y = ~x; // 11111111111111111111111111111010

It's important to note that the bitwise NOT operator only works on integers. If you try to use it on a non-integer value (such as a string or a floating-point number), it will be converted to an integer before the operation is performed.

The tilde operator can also be used as a shorthand for Math.floor() to round a number down to the nearest integer. For example:

let x = 5.7;
let y = ~~x;  // y is 5

In this example, the double tilde operator ~~ rounds the number x down to the nearest integer, resulting in y being set to 5. This is equivalent to using the Math.floor() function.

Just be mindful with the size of your integers using the double NOT operator

// 10 digits
> parseInt(9999999999)
9999999999
> ~~9999999999
1410065407

// 9 digits
> parseInt(999999999)
999999999
> ~~999999999
999999999

The Surprising Power of MongoDB's Limit(0) Method

aniketcodes — Sat, 17 Dec 2022 18:19:31 +0000

The limit() method in MongoDB allows you to specify the maximum number of documents that should be returned in a query result. By default, the limit() method returns all documents in a collection.
But what if you use limit(0)?
Instead of returning 0 records, it will return all the records present in the collection.

This happens because MongoDB treats 0 in limit() as infinity.

DEV Community: aniketcodes

The tilde(~) operator: the secret weapon for efficient integer conversion

The Surprising Power of MongoDB's Limit(0) Method