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What is the difference between bottom-up and top-down?
...tuitive and very easy to implement. Just write a recursive solution first, test it on small tests, add memoization (caching of already computed values), and --- bingo! --- you are done.
Usually you can also write an equivalent iterative program that works from the bottom up, without recursion. In t...
How do I find all files containing specific text on Linux?
...rience, the -i makes it slow down a lot, so don't use it if not necessary. Test it in a certain dir and then generalise. It should be completed within few minutes. I think a regular expression would make it slower. But my comments are based on suppositions, I suggest you to test it with time in fron...
What's the meaning of exception code “EXC_I386_GPFLT”?
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I wondered why this appeared during my unit tests.
I have added a method declaration to a protocol which included throws; but the potentially throwing method wasn't even used in that particular test. Enabling Zombies in test sounded like too much trouble.
Turns out a...
Typescript: difference between String and string
...nstance in various ways e.g. new String('foo') and Object('foo'). You can test for an instance of the String type with the instanceof operator, e.g. myString instanceof String.
string is one of JavaScript's primitive types, and string values are primarily created with literals e.g. 'foo' and "bar"...
Is it faster to count down than it is to count up?
... range of the numbers you're using: with the incrementing loop you have to test i<N each time round the loop. For the decrementing version, the carry flag (set as a side effect of the subtraction) may automatically tell you if i>=0. That saves a test per time round the loop.
In reality, on mo...
C# switch on type [duplicate]
...
@YevgeniGrinberg I haven't tested this, but I'm certain that typeof(object) != typeof(MyType) even though MyType is a subclass of object.
– sparebytes
Sep 17 '13 at 16:21
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Sort a text file by line length including spaces
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Answer
cat testfile | awk '{ print length, $0 }' | sort -n -s | cut -d" " -f2-
Or, to do your original (perhaps unintentional) sub-sorting of any equal-length lines:
cat testfile | awk '{ print length, $0 }' | sort -n | cut -d" " -f2...
Detect IF hovering over element with jQuery
...ntentional behaviour as we thought in the previous point.
If you want to test this in a particular jQuery version, just open the JSFidlle example at the beginning of this answer, change to the desired jQuery version and click "Run". If the colour changes on hover, it works.
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Edit 3 (March 9, 20...
How do I localize the jQuery UI Datepicker?
...xt/javascript">
$(document).ready(function() {
console.log("test");
$("#test").datepicker({
dateFormat: "dd.m.yy",
minDate: 0,
showOtherMonths: true,
firstDay: 1
});
});
</script>
</head>
<body>
<h1&...
Count how many records are in a CSV Python?
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2018-10-29 EDIT
Thank you for the comments.
I tested several kinds of code to get the number of lines in a csv file in terms of speed. The best method is below.
with open(filename) as f:
sum(1 for line in f)
Here is the code tested.
import timeit
import csv
import p...