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Break statement in Lua Programming
The break statement is used when we want to break or terminate the execution of a loop. Once the break statement is reached, the control is transferred from the current loop to whatever is written after the loop. This statement breaks the inner loop (for,repeat, or while) that contains it; it cannot be used outside a loop. After the break, the program continues running from the point immediately after the broken loop.
A break statement is mostly used in conditional statements and also in loops of all types. It is present in almost all popular programming languages.
Syntax
break
Now, let’s consider a very simple example where we will try to iterate over the elements of an array, and once we found that the current item of the array is equal to a number that we were trying to search, we will break the loop and then print the value of the current element of the array.
Example
Consider the example shown below −
a = {11,12,13,14,15,16,17}
v = 16
local i = 1
while a[i] do
if a[i] == v then break end
i = i + 1
end
print(a[i])
print("Completed")Output
16 Completed
Now let’s consider a more complicated case, where we want to iterate over the elements of an array and break the loop whenever we have encountered a duplicated value.
Example
Consider the example shown below −
iterable = {a=1, doe1={name=1}, doe2={name=2}, doe3={name=2}}
var2 = 1
for i, v in pairs(iterable) do
print('trying to match', i)
if string.match(i,'doe') then
print('match doe', i, v.name, var2)
if v["name"] == var2 then
txterr = "Invalid name for "..i
duplicate = true
print('found at i=', i)
end
if duplicate then
print('breaking the loop')
break
end
end
endOutput
trying to matchdoe3 match doedoe3 2 1 trying to matchdoe2 match doedoe2 2 1 trying to matcha trying to matchdoe1 match doedoe1 1 1 found at i= doe1 breaking the loop
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