Expression Operator Overview

Fluxion mirrors MongoDB aggregation operators so you can compose complex transformations inside $project, $addFields, $group, and other stages. Browse the categories below, then use the sidebar for the complete alphabetical list.

Comparison & Logic

• $eq, $ne, $gt, $gte, $lt, $lte
• Set membership: $in, $nin
• Logical helpers: $and, $or, $not, $switch, $ifNull

Math & Numeric

• Arithmetic: $add, $subtract, $multiply, $divide, $mod
• Rounding: $ceil, $floor, $round, $trunc
• Advanced math: $pow, $sqrt, $exp, $ln, $log10

Array Utilities

• Transformation: $map, $filter, $reduce
• Structure: $concatArrays, $arrayElemAt, $zip
• Analysis: $size, $slice, $reverseArray

String Processing

• Case & trimming: $toLower, $toUpper, $trim, $ltrim, $rtrim
• Substrings: $substr, $substrBytes, $substrCP
• Matching: $split, $strcasecmp, $regexMatch

Date & Time

• Conversion and extraction: $toDate (covers $year, $month, $week, etc. through options).
• Differences and arithmetic: $add with date operands, $subtract, and $convert.

Type & Object Utilities

• Conversion: $convert, $toInt, $toDouble, $toBool, $toString
• Inspection: $type, $literal
• Object helpers: $getField, $setField, $unsetField, $mergeObjects, $objectToArray, $arrayToObject

Special Execution

• $function for JavaScript-style custom logic with body, args, and optional lang.

Looking for something specific? Use the search box or the alphabetical list in the sidebar to jump straight to the operator you need.