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How to access array elements in a Django template?
...o template is used for four different notations in Python. In a template, foo.bar can mean any of:
foo[bar] # dictionary lookup
foo.bar # attribute lookup
foo.bar() # method call
foo[bar] # list-index lookup
It tries them in this order until it finds a match. So foo.3 wi...
How to check if object (variable) is defined in R?
...
See ?exists, for some definition of "...is defined". E.g.
> exists("foo")
[1] FALSE
> foo <- 1:10
> exists("foo")
[1] TRUE
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Performance difference between IIf() and If
...hink:
' Usage 1
Dim result = If(a > 5, "World", "Hello")
' Usage 2
Dim foo = If(result, "Alternative")
The first is basically C#'s ternary conditional operator and the second is its coalesce operator (return result unless it’s Nothing, in which case return "Alternative"). If has thus replace...
How can I do string interpolation in JavaScript?
...rafting of the spec. Use them like this:
> var n = 42;
undefined
> `foo${n}bar`
'foo42bar'
You can use any valid JavaScript expression inside the {}. For example:
> `foo${{name: 'Google'}.name}bar`
'fooGooglebar'
> `foo${1 + 3}bar`
'foo4bar'
The other important thing is, you don't ...
How to split one string into multiple variables in bash shell? [duplicate]
...how you can read each individual character into array elements:
$ read -a foo <<<"$(echo "ABCDE-123456" | sed 's/./& /g')"
Dump the array:
$ declare -p foo
declare -a foo='([0]="A" [1]="B" [2]="C" [3]="D" [4]="E" [5]="-" [6]="1" [7]="2" [8]="3" [9]="4" [10]="5" [11]="6")'
If there...
jQuery send string as POST parameters
.../Same_origin_policy
url: 'http://nakolesah.ru/',
data: {
'foo': 'bar',
'ca$libri': 'no$libri' // <-- the $ sign in the parameter name seems unusual, I would avoid it
},
success: function(msg){
alert('wow' + msg);
}
});
...
How to use JUnit to test asynchronous processes
... run synchronously.
So suppose I'm trying to test the asynchronous method Foo#doAsync(Callback c),
class Foo {
private final Executor executor;
public Foo(Executor executor) {
this.executor = executor;
}
public void doAsync(Callback c) {
executor.execute(new Runnable() {
@O...
Concatenating two lists - difference between '+=' and extend()
... for function and also not global)
def main():
l = [1, 2, 3]
def foo():
l.extend([4])
def boo():
l += [5]
foo()
print l
boo() # this will fail
main()
It's because for extend case compiler will load the variable l using LOAD_DEREF instruction, but for +...
VB.NET equivalent to C# var keyword [duplicate]
...rongly-typed; it's just done so implicitly (like the C# var) keyword.
Dim foo = "foo"
foo is declared as a String.
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What is the meaning of the 'g' flag in regular expressions?
...y starts searching at the lastIndex.
// regular regex
const regex = /foo/;
// same regex with global flag
const regexG = /foo/g;
const str = " foo foo foo ";
const test = (r) => console.log(
r,
r.lastIndex,
r.test(str),
r.lastIndex
);
// Test the normal one...