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Resolve promises one after another (i.e. in sequence)?
...uential manner. readFiles returns a promise, which is resolved only once all files have been read in sequence.
27 Answers...
Benefits of EBS vs. instance-store (and vice-versa) [closed]
...provider of free AMIs for popular applications and development frameworks (PHP, Joomla, Drupal, you get the idea). I can tell you that EBS-backed AMIs are significantly more popular than S3-backed. In general I think s3-backed instances are used for distributed, time-limited jobs (for example, large...
Show or hide element in React
...</div>
);
}
// or in more modern JS and stateless react
const Example = props => <div className={props.shouldHide}/>Hello</div>
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Change a Git remote HEAD to point to something besides master
...-f origin master
Making master have what you want people to use, and do all other work in branches.
(a "git-symbolic-ref HEAD refs/head/published" would not be propagated to the remote repo)
This is similar to "How do I delete origin/master in Git".
As said in this thread: (emphasis mine)
"git...
Set every cell in matrix to 0 if that row or column contains a 0
... = len(m)
### pass 1
# 1 rst line/column
c = 1
for i in range(N):
c &= m[i][0]
l = 1
for i in range(1,N):
l &= m[0][i]
# other line/cols
# use line1, col1 to keep only those with 1
for i in range(1,N):
for j in range(1,N):
if m[i][j] == 0:
m[0][j] = 0
...
When can I use a forward declaration?
...inter or a reference to the incomplete type:
class Foo {
X *p;
X &r;
};
Declare functions or methods which accept/return incomplete types:
void f1(X);
X f2();
Define functions or methods which accept/return pointers/references to the incomplete type (but without using its members)...
convert ArrayList to JSONArray
I have an ArrayList that I use within an ArrayAdapter for a ListView. I need to take the items in the list and convert them to a JSONArray to send to an API. I've searched around, but haven't found anything that explains how this might work, any help would be appreciated.
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Check if a string is html or not
...
A better regex to use to check if a string is HTML is:
/^/
For example:
/^/.test('') // true
/^/.test('foo bar baz') //true
/^/.test('<p>fizz buzz</p>') //true
In fact, it's so good, that it'll return true for every string passed to it, which is because every string is HTML....
How do I declare a 2d array in C++ using new?
... least, consider using macros or inline functions to reduce overhead. An example macro for C++: #define ROW_COL_TO_INDEX(row, col, num_cols) (row*num_cols + col) Then you can use it as int COLS = 4; A[ ROW_COL_TO_INDEX(r, c, COLS) ] = 75; The overhead really affects when we do matrix multiplication...
Arrow operator (->) usage in C
...ruct foo var;
struct foo* pvar;
pvar = malloc(sizeof(pvar));
var.x = 5;
(&var)->y = 14.3;
pvar->y = 22.4;
(*pvar).x = 6;
That's it!
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