進階運算式編輯器語法 syntax

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• TL;DR: This page covers the core syntax rules of the Journey advanced expression editor — operator precedence with parentheses, case sensitivity for operators and functions, and the expected return type for each editor context.

Intents:

• Control expression evaluation order by wrapping sub-expressions in parentheses
• Write operators (and, or, not) in lowercase to avoid syntax errors
• Use correctly cased function names (e.g. inAudience() not INAUDIENCE())
• Understand that conditions must return a boolean, custom timers must return dateTimeOnly, and action parameter mappings can return any type

Glossary:

• Expression priority: The order in which operators are evaluated; multiplications and divisions take priority over additions and subtractions (product-specific)
• Case sensitivity: In the advanced editor, operators must be lowercase, function names are case-sensitive, and field references are case-sensitive as authored by the user (product-specific)
• dateTimeOnly: The return type required for custom timer (Wait activity) expressions; represents a date-time without a timezone (product-specific)

Guardrails:

• Operators (and, or, not, etc.) must be written in lowercase — uppercase variants are invalid
• All function names are case-sensitive — inAudience() is valid but INAUDIENCE() is not
• Arithmetic follows standard precedence: * and / evaluate before + and -; use parentheses to override
• Conditions always return a boolean; custom timers always return dateTimeOnly

Terminology:

• Canonical name: Advanced Expression Editor Syntax — Acronym: none — variants: expression syntax, editor syntax
• Synonyms: “expression priority” = “operator precedence”; “parentheses” = “brackets” (in expression context)
• Do not confuse: operator case sensitivity (operators must be lowercase) ≠ field reference case sensitivity (field names are user-authored and case-sensitive as written)

FAQ:

• Q: Does 4 + 2 * 10 evaluate to 60 or 24? — It evaluates to 24 because * takes priority over +; use (4 + 2) * 10 to get 60.
• Q: Can I write AND in uppercase in an expression? — No; all operators must be lowercase (and, or, not).
• Q: Are function names case-sensitive? — Yes; inAudience() is valid but INAUDIENCE() is not.
• Q: What type must a condition expression return? — A boolean.
• Q: What return type is required for a custom Wait activity timer expression? — dateTimeOnly.