我试图了解reduceLeft的工作原理，但是我没有得到reduceLeft实现的Scala语法。 def reduceLeft [B>：A]（op：（B，A）=> B）：B
da@n53sm:~$ traceroute istanbul.edu.tr
traceroute to istanbul.edu.tr (194.27.128.98), 30 hops max, 60 byte packets
1 100.90.170.253 (100.90.170.253) 0.444 ms 0.505 ms 0.593 ms
2 172.16.16.1 (172.16.16.1) 0.976 ms 0.914 ms 0.953 ms
3 172.16.0.1 (172.16.0.1) 1.982 ms 2.329 ms 1.585 ms
4 193.255.0.121 (193.255.0.121) 7.373 ms 7.236 ms 7.514 ms
5 193.255.0.246 (193.255.0.246) 8.310 ms 8.213 ms 8.363 ms
6 * * *
7 * * *
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13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
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20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
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27 * * *
28 * * *
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30 * * *
da@n53sm:~$ sudo lft istanbul.edu.tr
traceroute to istanbul.edu.tr (194.27.128.98), 30 hops max, 60 byte packets
1 100.90.170.253 (100.90.170.253) 0.502 ms 0.482 ms
2 172.16.16.1 (172.16.16.1) 0.558 ms 0.579 ms
3 172.16.0.1 (172.16.0.1) 3.936 ms 1.075 ms
4 193.255.0.121 (193.255.0.121) 6.835 ms 7.135 ms
5 193.255.0.246 (193.255.0.246) 7.814 ms 7.850 ms
6 www.istanbul.edu.tr (194.27.128.98) 7.621 ms 7.536 ms
是什么意思？
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