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How to calculate time elapsed in bash script?
...ssignment plus the assigned value.
Thus, you can just set SECONDS to 0 before starting the timed event, simply read SECONDS after the event, and do the time arithmetic before displaying.
SECONDS=0
# do some work
duration=$SECONDS
echo "$(($duration / 60)) minutes and $(($duration % 60)) seconds el...
Should it be “Arrange-Assert-Act-Assert”?
...ellent book xUnit Test Patterns by Gerard Meszaros (highly recommended).
Normally, I don't use this pattern myself, since I find it more correct to write a specific test that validates whatever precondition I feel the need to ensure. Such a test should always fail if the precondition fails, and thi...
Bash script error [: !=: unary operator expected
In my script I am trying to error check if the first and only argument is equal to -v but it is an optional argument. I use an if statement but I keep getting the unary operator expected error.
...
In log4j, does checking isDebugEnabled before logging improve performance?
I am using Log4J in my application for logging. Previously I was using debug call like:
16 Answers
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Why use pip over easy_install? [closed]
...
Many of the answers here are out of date for 2015 (although the initially accepted one from Daniel Roseman is not). Here's the current state of things:
Binary packages are now distributed as wheels (.whl files)—not just on PyPI, but in third-party repositories li...
In practice, what are the main uses for the new “yield from” syntax in Python 3.3?
... out of the way first. The explanation that yield from g is equivalent to for v in g: yield v does not even begin to do justice to what yield from is all about. Because, let's face it, if all yield from does is expand the for loop, then it does not warrant adding yield from to the language and precl...
String to object in JS
...arse(text[, reviver]);
Examples:
1)
var myobj = JSON.parse('{ "hello":"world" }');
alert(myobj.hello); // 'world'
2)
var myobj = JSON.parse(JSON.stringify({
hello: "world"
});
alert(myobj.hello); // 'world'
3)
Passing a function to JSON
var obj = {
hello: "World",
sayHello: (fun...
Multiline Comment Workarounds?
I (sort of) already know the answer to this question. But I figured it is one that gets asked so frequently on the R Users list, that there should be one solid good answer. To the best of my knowledge there is no multiline comment functionality in R. So, does anyone have any good workarounds?
...
How can I check if a var is a string in JavaScript?
... {
// this is a string
}
On a related note: the above check won't work if a string is created with new String('hello') as the type will be Object instead. There are complicated solutions to work around this, but it's better to just avoid creating strings that way, ever.
...
How to calculate date difference in JavaScript?
... This is so the right answer. Eg: to get difference in days do Math.floor((date2 - date1) / (1000*60*60*24)) -- for difference in any other unit, adjust the denominator (the base value is in ms).
– trisweb
Oct 22 '13 at 19:54
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