CODEWITHSUNDEEP
pine-script
Jakub Szurlej
Jakub Szurlej

Reputation: 329

How to understand logic of Tradingview PineScript "?" if statement

I am having troubles with understanding PineScript ? statement logic, there is such function in Pinescript on TradingView:

updown(s) =>
    isEqual = s == s[1]
    isGrowing = s > s[1]
    ud = 0.0
    ud := isEqual ? 0 : isGrowing ? (nz(ud[1]) <= 0 ? 1 : nz(ud[1])+1) : (nz(ud[1]) >= 0 ? -1 : nz(ud[1])-1)
    ud

I have tried my best to crack the logic of the ? expression above, but I am not sure if I am correct. I have written the logic in pseudo code, but I need someone to tell me if I am correct.

if s == s.shift(1):
    ud = 0
else:
    if s > s.shift(1):
        if (nz(ud[1]) <= 0:
            ud = 1
        else:
            nz(ud[1]) + 1)
    else:
        if nz(ud[1]) >= 0:
            ud = -1
        else:
            nz(ud[1]) - 1)

If I am correct or wrong please tell because I have no idea myself.

Upvotes: 0

Views: 233

Answers (1)

vitruvius
vitruvius

Reputation: 21209

?: is called ternary operator.

condition ? valueWhenConditionIsTrue : valueWhenConditionIsFalse

You can write the below statement:

ud := isEqual ? 0 : isGrowing ? (nz(ud[1]) <= 0 ? 1 : nz(ud[1])+1) : (nz(ud[1]) >= 0 ? -1 : nz(ud[1])-1)

as

ud := if (isEqual)
    0
else
    if (isGrowing)
        if ((nz(ud[1]) <= 0)
            1
        else
            nz(ud[1])+1)
    else
        if ((nz(ud[1]) >= 0)
            -1
        else
            nz(ud[1])-1)

Upvotes: 2

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