Lua concat()

The concat() function is used to join the values of a table into a single string, separated by a specified separator. This function is particularly valuable when a table needs to be converted into a formatted string representation. The method allows for the use of a custom separator between values and the option to specify a range of indices to concatenate.

Syntax

concat(table, separator, [i], [j])

Parameters

concat() has the following parameters:

• table: The table containing values to concatenate.
• separator: The character or string used to separate the concatenated values.
• [i] (optional): The starting index in the table for concatenation.
• [j] (optional): The ending index in the table for concatenation.

Example

In this example, the fruits table contains four elements. table.concat() is used to join the elements from index 2 to 3 (inclusive) with a comma and space as the separator. The resulting string is then printed.

local fruits = {"apple 🍎", "banana 🍌", "cherry 🍒", "watermelon 🍉"}
local result = table.concat(fruits, ", ", 2, 3)
print(result)

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The output is the following:

banana 🍌, cherry 🍒

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