How do you write an else if in Pine Script v6?

Write else if followed by the condition on the same line, with the subsequent execution block indented by 4 spaces on the next line. Example: else if close < open.

Why do I get an undeclared identifier error with if statements?

If you declare a variable inside an if block using the = operator, that variable only exists within that block. Declare the variable before the if statement, then update it inside using the := reassignment operator.

Can an if statement return a value in Pine Script?

Yes. You can assign the result of an if block to a variable: myColor = if close > open color.green else color.red. Both branches must return matching data types.

What is the indentation rule for Pine Script if statements?

Statements inside an if or else block must be indented by exactly 4 spaces or one tab. Nested if statements require an additional 4 spaces (8 spaces total).

How does the ternary operator work in Pine Script?

The ternary operator uses condition ? valueIfTrue : valueIfFalse. It evaluates the boolean condition and returns the first value if true, or the second value if false.

Pine Script Control Flow

Pine Script If Else: Conditional Logic, Ternary Operators & Multi-Conditions

Q: Why do I get an undeclared identifier error with if statements?

If you declare a variable inside an if block using the = operator, that variable only exists within that block. Declare the variable before the if statement, then update it inside using the := reassignment operator.

Q: Can an if statement return a value in Pine Script?

Yes. You can assign the result of an if block to a variable: myColor = if close > open color.green else color.red. Both branches must return matching data types.

In Pine Script v6, conditional branching is handled using the if statement structure and ternary expressions. Code blocks inside an if or else block must be indented by exactly 4 spaces or one tab. Variables declared outside an if block can be modified inside it using the reassignment operator (:=). Additionally, an if statement can function as an expression that returns a value directly to a variable.

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Syntax patterns: If statements vs ternary expressions in v6

Pine Script supports two primary styles for conditional logic: full if else blocks for multi-step logic and the ternary operator for quick scalar evaluations.

Pattern	Syntax structure	When to use	Key restriction
Standard if block	if condition\n statement	Executing multi-line actions or order submissions	Requires strict 4-space indentation
if else ladder	if c1\n s1\nelse if c2\n s2\nelse\n s3	Categorizing market regimes into multiple exclusive states	Blocks execute sequentially until first true match
Value-returning if	val = if c1\n res1\nelse\n res2	Assigning complex multi-line calculation outputs to one variable	Every branch must return the same data type
Ternary operator	val = condition ? trueVal : falseVal	Plot color selection and simple threshold toggles	Limited to single expressions per branch

Complete Pine Script v6 script with nested if-else structures

The following indicator classifies market trends into five distinct regimes (Strong Bullish, Weak Bullish, Neutral, Weak Bearish, Strong Bearish) using multi-condition if else logic and formatted on-chart tables.

Pine Script v6: Multi-condition trend regime classifierpinescript

//@version=6
indicator("Multi-Condition Regime Classifier [v6]", overlay = false)

// Inputs
int fastLen = input.int(20, "Fast EMA")
int slowLen = input.int(50, "Slow EMA")
int rsiLen = input.int(14, "RSI Length")

// Technical indicators
float fastEma = ta.ema(close, fastLen)
float slowEma = ta.ema(close, slowLen)
float rsiVal = ta.rsi(close, rsiLen)

// Multi-condition evaluation using if-else expressions
string regimeText = if close > fastEma and fastEma > slowEma
    if rsiVal > 60
        "Strong Bullish"
    else
        "Weak Bullish"
else if close < fastEma and fastEma < slowEma
    if rsiVal < 40
        "Strong Bearish"
    else
        "Weak Bearish"
else
    "Consolidation / Neutral"

// Color determination using ternary operator
color regimeColor = regimeText == "Strong Bullish" ? color.green :
                    regimeText == "Weak Bullish"   ? color.teal :
                    regimeText == "Strong Bearish" ? color.red :
                    regimeText == "Weak Bearish"   ? color.maroon : color.gray

// Plot oscillator score
int score = if regimeText == "Strong Bullish"
    2
else if regimeText == "Weak Bullish"
    1
else if regimeText == "Weak Bearish"
    -1
else if regimeText == "Strong Bearish"
    -2
else
    0

plot(score, "Market Regime Score", color = regimeColor, style = plot.style_columns)
hline(0, "Neutral Line", color = color.gray)

Important rules for variable scope and reassignment

A frequent source of Pine Script compile errors is misunderstanding local vs global variable scope inside conditional blocks:

Reassignment with := operator: If a variable is declared globally (e.g. float myVal = 0.0), modifying it inside an if block requires myVal := 1.0. Using myVal = 1.0 creates a local variable that vanishes outside the block.
Persistent state with var: If a variable must remember its updated value across chart candles, declare it with var outside the if statement: var float stopPrice = na.
Type consistency: When assigning a variable from an if expression, all branches (if, else if, else) must resolve to the identical data type (all float, all string, or all int).
No parentheses required: Unlike C++ or JavaScript, Pine Script does not require wrapping if conditions in parentheses: if close > open is standard syntax.

Evaluating multiple conditions with logical operators

When testing compound criteria, structure your boolean expressions with clear precedence:

and operator: Both expressions must be true. Example: if close > open and volume > ta.sma(volume, 20).
or operator: At least one expression must be true. Example: if ta.crossover(close, ema20) or close > highestHigh.
not operator: Inverts the boolean result. Example: if not na(priorStop).
Grouping with parentheses: When combining and with or in compound rules, wrap related conditions in parentheses to guarantee intended priority.

Where Pineify fits

Pine Script AI Coding Agent

Generate complex nested if-else statements, multi-timeframe regime filters, and state machine strategies in Pine Script v6 with Pineify AI.

Also useful: Visual Pine Editor. Combine rules and filters visually without typing indentations or variable reassignment symbols.

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Related resources

Pine Script Crossover Signals Pine Script NZ and NA Functions Pine Script Event History Guide Visual Pine Script Editor

Frequently asked questions

Conditional logic and decision trees depend on accurate chart inputs and consistent price series. Always backtest strategies across multiple market regimes prior to live execution.

Sources and verification

Last verified: 2026-10-13