我如何指定在 pinescript 中迭代哪个数组？

Question

let's pretend that the for loop evaluate if the symbol(s) in the list is in uptrend or downtrend, "i > 0" means uptrend and " i < 0" means downtrend

for example if i want to iterate throught a list in python i would do it this way:

uptrend = 0
downtrend = 0

list = ["AXP", "APPL", "MMM", "TSLA", "FB", "AMZN"]

for i in list:
    if i > 0:
        uptrend += 1

    else:
        downtrend += 1

how do i achieve this same code in pinescript?

so far what i did in pinescript is this:

uptrend = 0
downtrend = 0

string[] list = array.from("AXP", "APPL", "MMM", "TSLA", "FB", "AMZN")

but i am stuck on the for loop part because i cannot specify which array the i is from, in python i use (for i in list), what do i use in the place of "in" in pinescript?

Answer 1

pinescript also supports for.. in .

//@version=5
indicator("My script")

var string[] list = array.from("AXP", "APPL", "MMM", "TSLA", "FB", "AMZN")
string s = ""

for i in list
    s := s + i + " "
    
var testTable = table.new(position = position.top_right, columns = 1, rows = 1, bgcolor = color.yellow, border_width = 1)
if barstate.islast
    table.cell(table_id = testTable, column = 0, row = 0, text = s)