数学函数 math-functions

random()

返回小数。

• 小数
• 整数

round(<decimal>)

round(<integer>)

返回整数。

round(3.14)

返回3。

round(3.54)

返回4。

round(-3.14)

返回–3。

round(3)

返回3。

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• TL;DR: This page documents the two math functions available in AJO journey expressions — random for generating a random decimal between 0 and 1, and round for rounding a decimal or integer to the nearest integer.

Intents:

• Generate a random decimal value between 0 and 1 for sampling or randomization logic using random
• Round a decimal number to the nearest integer using round
• Apply rounding in business logic where whole numbers are required from decimal calculations

Glossary:

• random: A function that returns a pseudo-random decimal value from 0 (inclusive) to 1 (exclusive) (product-specific)
• round: A function that returns the closest integer to the input, with half-values rounding toward positive infinity

Guardrails:

• random() takes no parameters
• round accepts decimal or integer input and always returns an integer
• Ties in round are resolved by rounding toward positive infinity (e.g., 3.5 rounds to 4, -3.5 rounds to -3)

Terminology:

• Canonical name: Math functions — Acronym: none — variants: mathematical functions, numeric functions
• Synonyms: “round” = “round to nearest integer”
• Do not confuse: “round” (rounds to the nearest integer) ≠ conversion functions like toInteger (truncates the decimal part without rounding)

FAQ:

• Q: What does random() return? — It returns a random decimal number between 0 and 1.
• Q: How does round handle negative numbers? — It rounds toward positive infinity, so round(-3.14) returns -3 and round(-3.54) returns -3 as well (closest integer toward positive infinity).
• Q: What is the difference between round and toInteger? — round rounds to the nearest integer (3.7 becomes 4), while toInteger truncates the decimal part without rounding (3.7 becomes 3).
• Q: Does random take any parameters? — No, random() requires no parameters and always returns a decimal between 0 and 1.