$exp Operator - (MongoDB Misc)

In MongoDB, you can use the $exp operator in aggregation pipelines to perform exponential calculations on numeric values. In this page, we will discuss the syntax, examples, output, explanation, use, important points, and summary of the $exp operator in MongoDB.

Syntax

The $exp operator has the following syntax:

{ $exp: <expression> }

The <expression> is a numeric value that will be exponentiated.

Example

Consider the following sample collection of products:

[
  { "product": "book", "price": 25 },
  { "product": "notebook", "price": 12 },
  { "product": "pen", "price": 2 }
]

To exponentiate the price field of each product by 2, we can use the $exp operator in an aggregation pipeline like this:

db.products.aggregate([
  { $project: { product: 1, squaredPrice: { $exp: "$price" } } }
])

The output will be:

[
  { "product": "book", "squaredPrice": 7.200489933738588e+10 },
  { "product": "notebook", "squaredPrice": 1.627547914163934e+5 },
  { "product": "pen", "squaredPrice": 7.3890560989306495 }
]

Explanation

The $exp operator performs exponential calculations on numeric values. It returns natural exponentiation, which is the mathematical constant e raised to the power of the specified number. The <expression> can be any valid numeric expression.

Use

The $exp operator can be used in aggregation pipelines to perform exponential calculations on fields containing numeric data. This can be useful for various situations, like when you need to balance data by its exponential value.

Important Points

• The $exp operator is used for exponential calculations on numeric values.
• The <expression> can be any valid numeric expression.

Summary

In this page, we discussed the $exp operator in MongoDB. We covered the syntax, example, output, explanation, use, important points, and summary of the $exp operator. By using the $exp operator in aggregation pipelines, you can exponentiate fields containing numeric data in your MongoDB documents.