Loops (Iteration Constructs)

Loops - Programming structures that repeat a block of code multiple times. Common loop types include for, while, and do-while. They are useful in trading bots for scanning historical bars, updating indicators, or continuously checking conditions. GeeksforGeeks defines a loop (e.g. while loop) as an “entry-controlled structure that repeatedly executes a block of code as long as a specified condition is true”.

• Definition: A for, while, or do-while loop iterates over data. For example, looping through bars to compute an indicator or backtest logic.

• Context: In a live EA, loops are often used in tick or bar events. For example, iterating through orders:

  for(int i = OrdersTotal()-1; i >= 0; i--) { if (OrderSelect(i, SELECT_BY_POS) && OrderType() == OP_BUY) OrderClose(OrderTicket(), OrderLots(), Bid, 5); }

• Example:

  // cAlgo example: loop over 100 previous bars to find a pattern for(int i = Bars.Count - 100; i < Bars.Count; i++) { if (Bars.HighPrices[i] > Bars.HighPrices[i-1] && Bars.LowPrices[i] > Bars.LowPrices[i-1]) Print("Higher high at bar ", i); }
  // NinjaScript (C#) for loop: for(int i = 1; i < Bars.Count; i++) { if (Close[i] > SMA(20)[i]) count++; }