Types & variables

Primitive types are int, float, bool, string, datetime and color.

int      period = 14;
float    price  = 100.5;
bool     active = true;
string   note   = "entry";
datetime start  = '2026-07-30 09:15';
color    up     = #00ff00;

Constants

A const must be initialised and cannot be reassigned.

const int MAX_QTY = 5;

Persistent variables (global)

Prefix any variable with global to make it persistent: its value is saved against the running strategy and restored the next time that strategy runs. Use it to carry state across days — so a strategy can resume from where it left off instead of starting fresh each morning.

The initialiser is only a seed. It is used the very first time the variable is created; after that a stored value always wins, so the variable is not reset on the next run.

global float  entryPrice = 0;     // seeded to 0 once; later runs load the saved value
global int    tradeCount = 0;
global string lastSignal = "";
global bool   isInTrade  = false;

onTick {
    if (entryPrice == 0) {
        OrderSend(NIFTY, BUY, 50, 0, 0, 0, NORMAL, DAY, "entry");
        entryPrice = Close(NIFTY, D1, 0);   // saved automatically when it changes
        tradeCount = tradeCount + 1;
    }
}

Notes. Values persist for paper and live trading only — in a backtest a global behaves like a normal variable (seeded from its initialiser, kept in memory) so that backtests stay repeatable. global cannot be combined with arrays.

Arrays

Declare an array with type[]. Indicators fill arrays; you can also initialise one with a list. Index with [i].

float[] sma;                    // declared, filled later by an indicator
int[]   levels = [100, 200, 300];

int first = levels[0];          // index access — [0] is the first element