# Generic for in Lua Programming

LuaServer Side ProgrammingProgramming

The generic for in Lua allows us to iterate over the values in an iterator fashion; it is much more powerful even though it looks simple. The Lua library has plenty of iterators, over which we can use the generic for loop.

## Syntax

for i, v in pairs(x) do
...
...
end

The i in the above syntax denotes the index of the items we are going to iterate over only by one, and the v denotes the actual values of those items. The x is the iterable item over which we are iterating, it can be a list, array, or map.

## Example

Now let’s consider a simple example where we will try to iterate over the items of an array and will print the index of the items in the array.

Consider the example shown below −

a = {11,12,13,14,15,16,17}

for i, v in pairs(a) do
print(i)
end

## Output

1
2
3
4
5
6
7

Now, instead of printing the index, let’s print both the indexes and values that are present inside the array.

## Example

Consider the example shown below −

a = {11,12,13,14,15,16,17}

for i, v in pairs(a) do
print(i)
print(v)
end

## Output

1
11
2
12
3
13
4
14
5
15
6
16
7
17

It should be noted that we can also omit the variable i or v depending on our use-case. Consider a case where we just need to print the value of the array. In that case, we can remove the identifier for index from the generic for loop.

## Example

Consider the example shown below −

a = {11,12,13,14,15,16,17}

for _, v in pairs(a) do
print(v)
end

## Output

11
12
13
14
15
16
17
Published on 01-Dec-2021 10:21:07