How to implement monotonic functions in pine-script

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Let's say we want a function that returns true or false if a data type from pine is monotonic increase. How could this be done?

algorithmic-trading tradingview-api pine-script
1 Answers
//@version=5
indicator("monotonic increase function", overlay = false)

n = input.int(5)

f_is_mon_inc(float[] _set) =>
    bool _is_mon_inc = true
    _size = array.size(_set)
    if _size > 1
        _maxval = array.max(_set)
        _minval = array.min(_set)
        _firstval = array.get(_set, _size - 1)
        _lastval = array.get(_set, 0)
        if _firstval == _minval and _lastval == _maxval
            for i = _size - 2 to 0
                _val_i = array.get(_set, i)
                _val_prev = array.get(_set, i + 1)
                if _val_i < _val_prev
                    _is_mon_inc := false
                    break
        else
            _is_mon_inc := false
    _is_mon_inc

var float[] set = array.new_float()

array.unshift(set, close)

if array.size(set) > n
    array.pop(set)

is_mon_inc = f_is_mon_inc(set)

plot(is_mon_inc ? 1 : 0)
rumpypumpydumpy0
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