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How to count duplicate value in an array in javascript
...nt = 0;
for (var i = 0; i < array_elements.length; i++) {
if (array_elements[i] != current) {
if (cnt > 0) {
document.write(current + ' comes --> ' + cnt + ' times<br>');
}
current = array_elements[i];
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How do I restart nginx only after the configuration test was successful on Ubuntu?
...I know, nginx would show an empty message and it wouldn't actually restart if the configuration is bad.
The only way to screw it up is by doing an nginx stop and then start again. It would succeed to stop, but fail to start.
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How to identify whether a file is normal file or directory
...h.islink() for symlinks for instance. Furthermore, these all return False if the file does not exist, so you'll probably want to check with os.path.exists() as well.
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UITableview: How to Disable Selection for Some Rows but Not Others
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This method will generate bug if you try to swipe to delete.
– Vive
Mar 16 '12 at 14:04
118
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A Windows equivalent of the Unix tail command [closed]
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If you use PowerShell then this works:
Get-Content filenamehere -Wait -Tail 30
Posting Stefan's comment from below, so people don't miss it
PowerShell 3 introduces a -Tail parameter to include only the last x lines
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What does the “===” operator do in Ruby? [duplicate]
...=== b
means whatever the author of a's class wants it to mean.
However, if you don't want to confuse the heck out of your colleagues, the convention is that === is the case subsumption operator. Basically, it's a boolean operator which asks the question "If I have a drawer labelled a would it mak...
indexOf method in an object array?
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It's not supported by IE8 but, if that's not a problem, this is the best solution.
– Antonio Laguna
Nov 22 '13 at 11:56
64
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JavaScript: filter() for Objects
... 5 has the filter() prototype for Array types, but not Object types, if I understand correctly.
15 Answers
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Matplotlib scatterplot; colour as a function of a third variable
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There's no need to manually set the colors. Instead, specify a grayscale colormap...
import numpy as np
import matplotlib.pyplot as plt
# Generate data...
x = np.random.random(10)
y = np.random.random(10)
# Plot...
plt.scatter(x, y, c=y, s=500)
plt.gray()
plt.show()
Or, if ...
What are the advantages of using nullptr?
...d, since it catches only calls with nullptr, not with a null pointer of a different type, like (void*)0. But I can believe it has some uses, even if all it does is save you defining a single-valued place-holder type of your own to mean "none".
– Steve Jessop
De...