Pine Script PINE: loops and mutable variables

We have updated Pine Script. The latest version contains the long-awaited features: loops and mutable variables. Besides, we released multiple improvements and bug fixes for strategies.

As you know, Pine Script is a series-oriented scripting language, where most of goals are achieved by converting series values with help of built-in functions. Yet we received a lot of feedback describing disadvantages of such approach and showing high demand on statements for loops.

Loop and mutable variables syntax is demonstrated below:

//@version=2
study("Simple Moving Average")
len = input(9)
sum = 0
for i = 0 to len-1
    sum := sum + close[i]
plot(sum/len)

sum’ is a mutable variable and a new value can be given to it by an operator  ‘:=’ in body of the loop.

Please note that we recommend to use a built-in function ‘sma’ for Moving Average as it calculates faster.

It’s just a very simple example, the loop doesn’t even return a value here (a = for …). You can use ‘break’ and ‘continue’ in loop body and set a step size for the counter (for … by 2). To learn more about loops and mutable variable, check our Tutorial.

Read more about the Pine Script Language in the Pine Script Tutorial and in the Pine Script Reference.

 

February 4, 2016
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