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How to count TRUE values in a logical vector
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MarekMarek
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Display number with leading zeros
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Jack M.Jack M.
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9
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From an array of objects, extract value of a property as array
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1524
Here is a shorter way of achieving it:
let result = objArray.map(a => a.foo);
OR
let resu...
Get the first element of each tuple in a list in Python [duplicate]
...r x in rows]
Below is a demonstration:
>>> rows = [(1, 2), (3, 4), (5, 6)]
>>> [x[0] for x in rows]
[1, 3, 5]
>>>
Alternately, you could use unpacking instead of x[0]:
res_list = [x for x,_ in rows]
Below is a demonstration:
>>> lst = [(1, 2), (3, 4), (...
List of ANSI color escape sequences
... discuss many other options below) in C you might write:
printf("\033[31;1;4mHello\033[0m");
In C++ you'd use
std::cout<<"\033[31;1;4mHello\033[0m";
In Python3 you'd use
print("\033[31;1;4mHello\033[0m")
and in Bash you'd use
echo -e "\033[31;1;4mHello\033[0m"
where the first part makes th...
Determine if a String is an Integer in Java [duplicate]
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341
The most naive way would be to iterate over the String and make sure all the elements are valid...
Can I set the height of a div based on a percentage-based width? [duplicate]
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4 Answers
4
Active
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Gray out image with CSS?
...e" src="something.jpg" />
</div>
css:
#myImage {
opacity: 0.4;
filter: alpha(opacity=40); /* msie */
}
/* or */
#wrapper {
opacity: 0.4;
filter: alpha(opacity=40); /* msie */
background-color: #000;
}
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Why is it wrong to use std::auto_ptr with standard containers?
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124
The C++ Standard says that an STL element must be "copy-constructible" and "assignable." In oth...
Why is Double.MIN_VALUE in not negative
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The IEEE 754 format has one bit reserved for the sign and the remaining bits representing the magnitude. This means that it is "symmetrical" around origo (as opposed to the Integer values, which have one more negative value). Thus the m...