Aggregation Expression - $ln

Function Build

Build $ln with the Ln function from the aggregation package.

// bson.D{bson.E{Key:"result", Value:bson.D{bson.E{Key:"$ln", Value:"$value"}}}}
result := aggregation.Ln("result", "$value")

Method Build (Builder)

Build $ln with the Ln method from aggregation.NewBuilder().

// bson.D{bson.E{Key:"result", Value:bson.D{bson.E{Key:"$ln", Value:"$value"}}}}
result := aggregation.NewBuilder().
    Ln("result", "$value").
    Build()

Build Without Key

When an expression needs to be passed as an argument to another expression, use a WithoutKey variant to build an expression fragment without an output field name.

LnWithoutKey

This variant is currently available as a builder method.

Method build (Builder):

// bson.D{bson.E{Key:"$ln", Value:"$value"}}
expr := aggregation.NewBuilder().
    LnWithoutKey("$value").
    Build()