Enums

enum Trend
    up    = "Bullish"
    down  = "Bearish"
    flat  = "Neutral"

• Each member has an identifier (used in code) and an optional title (shown to users in dropdowns).
• Omitting the title defaults it to the identifier:

enum Signal
    buy
    sell
    hold

t = Trend.up
if t == Trend.up
    log.info("bull")

Enum values are compared with ==/!=. They are not strings — you cannot concatenate them with + "foo". Call str.tostring(t) to get the display title, or str.tostring(t, format.id) to get the identifier.

Pass an enum as an input to get a dropdown automatically:

mode = input.enum(Trend.up, "Trend mode")

The dialog renders one row per member, labelled with the title.

An enum used in an exported function's signature must itself be exported:

//@version=1
library("Signals")

export enum Signal
    buy  = "Buy"
    sell = "Sell"
    hold = "Hold"

export decide(float fast, float slow) =>
    fast > slow ? Signal.buy : fast < slow ? Signal.sell : Signal.hold

Enum members can be collected into an array via enumname.all:

for s in Trend.all
    log.info(str.tostring(s))

enumname.all yields members in declaration order.

• Objects — larger structured types
• Inputs
• Libraries