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Line 245:
Line 245: − There's also a negated version of it:+ Line 251:
Line 251: − This is provided as a more readable version of '''if (!condition)'''.+ − Note that the braces are required in Perl, even if you've only got one line in the block. However, there is a clever way of making your one-line conditional blocks more English like:+ Line 269:
Line 269: − There's also a negated version, for the same reason we have '''unless''' :+ Line 275:
Line 275: − You can also use '''while''' in a post-condition:+ Line 281:
Line 281: − Exactly like C:+
→Conditional and looping constructs
}
}
There's also a negated version of it:
unless ( condition ) {
unless ( condition ) {
}
}
This is provided as a more readable version of '''if (!condition)'''.
Note that the braces are required in Perl, even if you've only got one line in the block. However, there is a clever way of making your one-line conditional blocks more English like:
# the traditional way
# the traditional way
}
}
There's also a negated version, for the same reason we have '''unless''' :
until ( condition ) {
until ( condition ) {
}
}
You can also use '''while''' in a post-condition:
print "LA LA LA\n" while 1; # loops forever
print "LA LA LA\n" while 1; # loops forever
==== for ====
==== for ====
Exactly like C:
for ($i = 0; $i <= $max; $i++) {
for ($i = 0; $i <= $max; $i++) {