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| _ = (0..1000000).to_a.map {|i| i * 2 } | |
| # _ = (0..1000000).to_a.map! {|i| i * 2 } | |
| puts File.read("/proc/#{Process.pid}/status").lines.grep(/^VmHWM:/) | |
| # map => VmHWM: 25408 kB | |
| # map! => VmHWM: 17544 kB |
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