Dictionary — Indicators and Strategies

[-_-] Dictionary The script shows an example implementation of dictionary-like data type which can store key:value pairs (Python style). Both keys and values can have any of the following type: • string • integer • float • boolean • color You can add items of different types to the same dictionary (e.g. key = 12 and value = "value" stored in the same dictionary with key = "key" and value = 0.23). Under the hood dictionary is a custom Object (see www.tradingview.com), that has two array fields (one for storing keys, another for storing values). Keys and values of different types are converted into a string representation when adding a new item to the dictionary. The value is then converted back to certain type (bool/color/etc.) from that string representation when being retrieved. Script also utilises the new Methods (see www.tradingview.com). The following methods are implemented: • init() -> initialises the array fields of dictionary (without this the script throws an error "Array methods can't be called when ID of array is na" • set(key, value) -> add a new item to dictionary; if an item for given key already exists - change it to new value • getS(key) -> get value of string type • getI(key) -> get value of integer type • getF(key) -> get value of float type • getB(key) -> get value of boolean type • getC(key) -> get value of color type • remove(key) -> removes item from dictionary • len() -> get length of dictionary (the number of keys) I could not make just one "get" function that returns any type of value (color/string/etc.), so instead I created a get function for each value type. Example usage: • you add a string item: dictionary.set(2, "string here") • you add a float item: dictionary.set(3, 24.56) • to retrieve first value (key=2) do this: dictionary.getS(2) • to retrieve second value (key=3) do this: dictionary.getF(3)

StringStringHashmap Library "StringStringHashmap" A simple implementation of a key string-to-string value dictionary in pine script create_ss_dict() Create an empty string-string dictionary Returns: the indices and elements of the dict add_key_value(key, value, i, e) Add new key-value pair in the dictionary Parameters: key : string value : string i : string the indices of the dictionary e : string the element of the dictionary get_value(key, i, e) Get the value of the given key Parameters: key : string i : string the indices of the dictionary e : string the element of the dictionary Returns: return the value of the given key change_value(key, value, i, e) Change the value of the given key Parameters: key : string value : string i : string the indices of the dictionary e : string the element of the dictionary

Simple Hashmap A very simple Hashmap in Pinescript version 4 It uses two arrays one to store indices and one to store values currently this only supports keys of type int and values of type floats. index array: (20, 30, 80, 90) value array: (9.1,8.1,6.5,3.5) You can access the value 9.1 by using the key 20. No fancy hash functions were used just a very simple practical mechanism.

Object: object oriented programming made possible! Hash map's in Pinescript?? Absolutely This Library is the first step towards bringing a much needed data structure to the Pine Script community. "Object" allows Pine coders to finally create objects full or unique key:value pairs, which are converted to strings and stored in an array. Data can be stored and accessed using dedicated get and set methods. The workflow is simple, but has a few nuances: 0. Import this library into your project; you can give it whatever alias you'd like (I'll be using obj) 1. Create your first object using the obj.new() method and assign it a variable or "ID". 2. Use the object's ID as the first argument into the obj.set() method, for the key and value there's one extra step required. They must be added as arguments to the appropriate prop_() method. Note: While objects in this library technically only store data as strings, any primitive data type can be converted to a string before being stored, meaning that one object can hold data from multiple types at once. There's a trade off though..Pine Script requires that all exported function parameters have pre-defined types, meaning that as convenient as it would be to have a single method for storing and returning data of every type, it's not currently possible. Instead there are functions to add properties for each individual type, which are then converted to strings automatically (the original type is flagged and stored along with the data). Furthermore, since switch/if statements can only return values of the same type, there must also be "get" methods which correspond with each type. Again, a single "get" method which auto-detects the returned value's type was the goal but it's just not currently possible. Instead each get method is only allowed to return a value of its own type. No worries though, all the "get" methods will throw errors if they can't access the data you're trying to access. In that error message, you'll be informed exactly which "get" method you need to use if you ever lose track of what type of data you should be returning. 3. The second argument for obj.set() method is the obj.prop_() method. You just plug in your key as a string and your value and you're done. Easy as that. Please do not skip this step, properties must be formatted correctly for data to be stored and accessed correctly 4. Obj.get_ (s: string, f: float, b: bool, i: int) methods are even easier, just choose whichever method will return the data type you need, then plug in your ID, and key and that's it. Objects will output data of the same type they were stored as! There's a short example at the end of the script if you'd like to see more! prop_string(string: key, string: value) returns property formatted to string and flagged as string type prop_float(string: key, float: value) returns property formatted to string and flagged as float type prop_bool(string: key, bool: value) returns property formatted to string and flagged as bool type prop_int(string: key, int: value) returns property formatted to string and flagged as int type Support for lines and shapes coming soon! new() returns an empty object set(string : ID, string: property) adds new property to object get_f(string : ID, string: key) returns float values get_s(string : ID, string: key) returns string values get_b(string : ID, string: key) returns boolean values get_i(string : ID, string: key) returns int values More methods like Obj.remove(), Obj.size(), Obj.fromString, Obj.fromArray, Obj.toJSON, Obj.keys, & Obj.values coming very soon!!