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Perl do, while, until, for, foreach

Loops
Perl provides several different means of repetitively executing blocks of statements.

While
The basic while loop tests an expression before executing a statement block
while (expression) {
statements;
}


Until
The until loop tests an expression at the end of a statement block; statements will be executed until the expression evaluates as true.
until (expression) {
statements;
}


Do while
A statement block is executed at least once, and then repeatedly until the test expression is false.
do {
statements;
} while (expression);


Do until
A statement block is executed at least once, and then repeatedly until the test expression is true.
do {
statements;
} until (expression);


For
The for loop has three semicolon-separated expressions within its parentheses. These expressions function respectively for the initialization, the condition, and re-initialization expressions of the loop. The for loop f
or (initial_exp; test_exp; reinit_exp) {
statements;
}


This structure is typically used to iterate over a range of values. The loop runs until the test_exp is false.
for ($i; $i<10;$i++) {
print $i;
}


Foreach
The foreach statement is much like the for statement except it loops over the elements of a list:
foreach $i (@some_list) {
statements;
}


If the scalar loop variable is omitted, $_ is used.


Conclusion

In this page (written and validated by ) you learned about Perl do, while, until, for, foreach . What's Next? If you are interested in completing Perl tutorial, your next topic will be learning about: Perl next last and goto.



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