Expression

Routes the flow on a boolean expression you assemble from comparisons—no code. Reach for it for the ordinary case: checking a status, comparing a count, testing whether a field is empty. Routes to true when the expression evaluates true, otherwise to false.

Fields

Field	Description
Expression	The boolean expression, built from the comparisons and combinators below.

Comparisons

A Comparison tests two values—a Left, an Operator, and a Right—each of which can be a variable or a literal.

Operator	True when…
Equals (==)	The two values are equal.
Not Equals (!=)	The two values differ.
Greater Than (>), Less Than (<)	One number is greater or less than the other, or one moment is later or earlier than the other.
Greater Or Equal (>=), Less Or Equal (<=)	One number is at least, or at most, the other; likewise for two moments.
Contains	The left value contains the right one.
Matches Regex	The left value matches a regular expression.

The ordering operators read both values as numbers when they can, and otherwise as moments: epoch milliseconds or an ISO-8601 timestamp with an offset, in any mix. That is how a condition tests whether an upstream date has passed—compare it against the run context's Now. A timestamp that names no zone of its own is not compared, since nothing here says which zone it was written in.

A Unary Comparison tests a single Operand:

Operator	True when…
Is Empty, Is Not Empty	The value is, or is not, empty.
Is Truthy, Is Not Truthy	The value is, or is not, truthy.

Combinators

Combinator	True when…
All Of	Every condition in its Conditions list is true.
Any Of	Any condition in its Conditions list is true.
Not	The single Condition inside it is false.

Combinators nest, so an expression can go as deep as the logic needs. The editor shows a readable preview of the whole expression as you build it.

What later steps see

The incoming payload, passed through unchanged on whichever path was chosen.