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Go: panic: runtime error: invalid memory address or nil pointer dereference
...pe AnimalSounder interface {
MakeNoise()
}
type Dog struct {
Name string
mean bool
BarkStrength int
}
func (dog *Dog) MakeNoise() {
//implementation
}
I forgot the *(dog Dog) part, I do not recommend it. Then you get into ugly trouble when calling MakeNoice on an AnimalSounde...
What does java.lang.Thread.interrupt() do?
...g example shows.
public class InterruptTest {
public static void main(String[] args) {
Thread.currentThread().interrupt();
printInterrupted(1);
Object o = new Object();
try {
synchronized (o) {
printInterrupted(2);
S...
Does Ruby regular expression have a not match operator like “!~” in Perl?
...
Back in perl, 'foobar' !~ /bar/ was perfectly perlish to test that the string doesn't contain "bar".
In Ruby, particularly with a modern style guide, I think a more explicit solution is more conventional and easy to understand:
input = 'foobar'
do_something unless input.match?(/bar/)
needs_ba...
Simplest way to check if key exists in object using CoffeeScript
...ike this response because key of obj will throw an error if the value is a string or number. Cannot use 'in' operator to search. In this case if the object is not undefined and not null it will work.
– jqualls
Jun 25 '14 at 20:14
...
Python Dictionary to URL Parameters
I am trying to convert a Python dictionary to a string for use as URL parameters. I am sure that there is a better, more Pythonic way of doing this. What is it?
...
Piping both stdout and stderr in bash?
...and stderr, 2>&1 redirects stderr back to stdout and grep sees both strings on stdin, thus filters out both.
You can read more about redirection here.
Regarding your example (POSIX):
cmd-doesnt-respect-difference-between-stdout-and-stderr 2>&1 | grep -i SomeError
or, using >=ba...
socket.emit() vs. socket.send()
...callback) is essentially equivalent to calling socket.emit('message', JSON.stringify(data), callback)
Without looking at the source code, I would assume that the send function is more efficient edit: for sending string messages, at least?
So yeah basically emit allows you to send objects, which i...
地图组件（高德地图） · App Inventor 2 中文网
... the
map feature.
类型
Returns the type of the map feature. For LineString, this returns MapFeature.LineString (“LineString”).
可见性
Specifies whether the 线段 should be visible on the screen. Value is 真
if the 线段 is showing and 假 if hidden.
事件
...
How to name variables on the fly?
...ax for assign:
assign(x, value)
x: a variable name, given as a character string. No coercion is done, and the first element of a character vector of length greater than one will be used, with a warning.
value: value to be assigned to x.
...
How to merge two files line by line in Bash
...
M-x replace-string in Emacs will take out tabs, presumably Vim and maybe some other text editors can do it too.
– Ben
Aug 8 '14 at 8:06
...