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Perl do, while, until, for, foreach

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

The basic while loop tests an expression before executing a statement block
while (expression) {

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) {

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

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

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) {

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;

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

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


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