Lua has a free functional libary, called fun. Since Lua does not come natively with map, filter, and reduce, we should write code with imperative approach. And I finally find out that Lua can do more than I thought. Logical operators help create conditional statements in functions, to understand what that means first lets get a basic idea of each of the logical operators. Lua capability is somehow limited and less attractive. To avoid inconsistent results, Lua raises an error when you mix strings and numbers in an order comparison, such as 2<'15'. Moreover, 2<15 is obviously true, but '2'<'15' is false (alphabetical order!). When comparing values with different types, you must be careful: Remember that '0'=0 is false. We also know that tables in Lua have no fixed size or length, we can add as many objects to it we want. ~= : Not Equal To - False if both values are equal to each other, otherwise True. As we already know that tables are a very powerful data structure in Lua, which internally uses an associative array in lua.= : Equal To - True only if both values are equal to each other.= : Greater Than or Equal To - Same as the Greater Than operator, but also True if both values are equal.: Greater Than - True if the value before the operator is greater than the second value.unpack(t, 2)) print( '(6):', table.Code: = ~=Relational operators always result in a value of TRUE or FALSE Assume the 'label' never changes, and entries are never added or deleted. I want to access elements sorted by 'label'. Table.insert inserts an element into the specified position.Įxample 1: t = print( '(1): By they way, I have a general Lua question. Lua provides some auxiliary functions to manipulate the table, for example insert, remove, etc. All elements of the table are always separated by a comma “,”

All index values of the table need to be enclosed in “” if it is a string, you can also remove the quotation marks and brackets that is, if there is no bracket It is considered to be a string index The table will not have a fixed length and size, and there will be new data The length will automatically grow when inserted The variable of the table is just an address reference, which will not affect the operation of the table (2).table The default initial index generally starts with 1 (1).table is an “associative array”, the index of the array can be a number or a string

Table is the Lua language An important data type, some characteristics of table are briefly listed as follows:

Lua table insert associative array