Thinking in Pine - Execution Model and Rollback on Realtime Bars

Hello All,

Welcome to another session of "Thinking in Pine" - short video tutorials on Pine Script.

Before continuing with this video, if you are not familiar with var, varip and regular variables, please watch our previous video - "Thinking in Pine - var, varip and regular variables"


🎲 Today's discussion points

• How var, varip and regular variable modification code works with historical and real time bar updates.
  
• Rollback concept of var variables
  

🎯 Example Program Used

// The statements execute on every tick
count = 0.0
count+=1

varip varipcount = 0 //executes only once on the first bar
varipcount+=1
// Reset counter on every bar
// if(barstate.isconfirmed)
//     varipcount:=0

// Rollbacks and assigns on every tick
var varcount = 0.0 //executes only once on the first bar
varcount+=1
// varcount:=varcount[1] -- Rollback
// varcount := varcount + 1 -- execute again

plot(varipcount, 'Varip Count')
plot(varcount, 'Var Count')
plot(count, 'Çount')


arrRegular = array.new<float>()
var arrVar = array.new<float>()
varip arrVarip = array.new<float>()
if(bar_index >= last_bar_index -5)
    arrRegular.push(close)
    arrVar.push(close)
    arrVarip.push(close)

    log.info('Regular : {0}', arrRegular)
    log.info('Var : {0}', arrVar)
    log.info('Varip : {0}', arrVarip)

🎲 References
Pine Script® User Manual - Execution Model