1.作用：從數(shù)組中刪除指定的元素
?2.格式：delete $array[index]
?3.實(shí)例：#delete
@fruits=("apple","banana","berry","orange");
print "1:@fruits"."\n";

delete $fruits[1];
print "2:@fruits"."\n";

print "3:$fruits[1]"."\n";

delete $fruits[5];
print "4:@fruits"."\n";

$size=@fruits;
print "5:".$size;

4.結(jié)果：
1:apple banana berry orange
2:apple? berry orange
3:
4:apple? berry orange
5:4

5.總結(jié)：
(1)index的值是從0開(kāi)始，當(dāng)index大于數(shù)組長(zhǎng)度時(shí)，函數(shù)delete對(duì)數(shù)組沒(méi)影響
(2)元素被刪除后，該位置上的值是undefined的

二、 grep 函數(shù)
?1.作用：按某種模式expr去匹配數(shù)組array中的每個(gè)元素，匹配成功的元素組成一個(gè)新的數(shù)組，返回該新數(shù)組
?2.格式：grep(expr,array);
?3.實(shí)例：
@words=("tomataes","tomorrow","patatoes","phantom","Tommy");
$count=grep(/tom/i,@words);
@items=grep(/tom/i,@words);

print "1.$count\n";
print "2.@items";

4.結(jié)果：
1.4
2.tomataes tomorrow phantom Tommy

5.總結(jié)：
(1)當(dāng)返回的新數(shù)組賦值給一個(gè)標(biāo)量時(shí)，該變量保存了新數(shù)組的元素個(gè)數(shù)
(2)當(dāng)返回的新數(shù)組賦值給一個(gè)數(shù)組時(shí)，該變量保存了新數(shù)組的所有元素
(3)i選項(xiàng)忽略大小寫