📈 Beginner Walkthrough: MQL4 to Pine Script

Migrating your custom indicators or Expert Advisors (EAs) from MetaTrader 4 (MQL4) to TradingView’s Pine Script is an essential transition for modern traders. The challenge lies in the fundamental differences between the two languages: MQL4 is a C-like, procedural language, while Pine Script is a much simpler, functional language designed specifically for time series data.

Key Conversion Differences:

• **Syntax and Structure:** MQL4 relies on loops and explicit buffer management, while Pine Script (v5+) uses intuitive, built-in functions (e.g., `ta.sma`, `plot`) that simplify complex calculations.
• **Bar Referencing:** MQL4 uses `Close[0]` for the current bar. Pine Script uses `close` for the current bar and `close[1]` for the previous bar, streamlining data access.
• **Series vs. Buffers:** MQL4 requires indexed **indicator buffers**. Pine Script utilizes **series variables**, which automatically manage historical data, making the code cleaner and more readable.