What Lipi does not have - GoCharting

Lipi has no construct for these 5 concepts. Before converting a script, check whether it relies on one of them: such a script needs a workaround, or that part has to go.

Concept	Why, and what to use instead	Languages that have it
Key-value collection	Lipi has no key-value collection type; use two arrays kept in step, or a user type.	MQL5, NinjaScript, Pine Script
Two-dimensional collection	Lipi has no matrix type; use an array with computed indexes.	MQL4, MQL5, NinjaScript, Pine Script
Reuse code from another file	A Lipi script is one file; copy the functions you need into it.	MQL4, MQL5, NinjaScript, Pine Script
Stop with an error	Lipi has no function that raises a runtime error; guard the calculation and skip it instead.	MQL4, MQL5, NinjaScript, Pine Script, thinkScript
Data from another symbol or timeframe	Lipi reads only the chart’s own symbol and timeframe.	MQL4, MQL5, NinjaScript, Pine Script, thinkScript

The list of names Lipi does not have covers single functions and variables; How to work around a name Lipi does not have shows the usual replacements.