Thinking in Pine - Functions Containing Var Variables

Hello everyone, welcome back to "Thinking in Pine" short video tutorials. In this video, we have discussed special cases of using var variables inside function definitions.

If you are not familiar with var variables, please take a step back and watch our earlier video - "Thinking in Pine - var, varip and regular variables"

🎲 Summary

• Using var within a function scope and how it behaves with multiple invocations.
  
• Using the functions containing var variable definitions within a loop.
  

🎯 Example Program Used

increment()=>
    var i = 0
    i+=1

var1 = increment()
var2 = increment()
var3 = increment()

// The code above is equivalent to
// var i1 = 0
// i1+=1
// var1 = i1

// var i2 = 0
// i2+=1
// var2 = i2

// var i3 = 0
// i3+=1
// var3 = i3

plot(var1, "Counter 1", color=color.blue)
plot(var2, "Counter 2", color=color.red)
plot(var3, "Counter 3", color=color.purple)

arr = array.from(var1, var2, var3)
for i=1 to 3
    arr.push(increment())
    // The code above is equivalent to
    // var i4 = 0
    // i4+=1
    // arr.push(i4)

if(bar_index == 4)
    log.info('Value of array containing incremental values : {0}', arr)

🎲 References

• Pine Script® User Manual - Variable declarations
• Pine Script® Reference Manual - var