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Is there a standard function to check for null, undefined, or blank variables in JavaScript?
...lared) you should check with the typeof operator. For instance
if( typeof foo !== 'undefined' ) {
// foo could get resolved and it's defined
}
If you can be sure that a variable is declared at least, you should directly check if it has a truthy value like shown above.
Further read: http://ty...
String literals: Where do they go?
...ndent on your platform and could change over time), just use arrays:
char foo[] = "...";
The compiler will arrange for the array to get initialized from the literal and you can modify the array.
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Is there a way to @Autowire a bean that requires constructor arguments?
...ts BeanService{
@Autowired
public MybeanService(MyConstructorClass foo){
// do something with foo
}
}
@Component
public class MyConstructorClass{
public MyConstructorClass(@Value("#{some expression here}") String value){
// do something with value
}
}
Update: i...
How to import and use different packages of the same name in Go language?
... (
t "text/template"
h "html/template"
)
func main() {
t.New("foo").Parse(`{{define "T"}}Hello, {{.}}!{{end}}`)
h.New("foo").Parse(`{{define "T"}}Hello, {{.}}!{{end}}`)
}
The code above gives two different names to the imported packages with the same name. So, there are now two di...
How to install node.js as windows service?
...ame="NODE_ENV" value="production"/>
<!-- OPTIONAL FEATURE:
FOO_SERVICE_PORT=8989 will be persisted as an environment
variable machine-wide.
-->
<persistent_env name="FOO_SERVICE_PORT" value="8989" />
</service>
...
chai test array equality doesn't work as expected
...eep Equal. It will compare nested arrays as well as nested Json.
expect({ foo: 'bar' }).to.deep.equal({ foo: 'bar' });
Please refer to main documentation site.
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How to set bootstrap navbar active class with Angular JS?
...erLinkActive will consider that active for any URL beginning with /, e.g. /foo/, /foo/bar etc. To match exactly, you need routerLinkActive="active" [routerLinkActiveOptions]="{exact:true}".
– Duncan Jones
Feb 25 '18 at 6:47
...
What is Delegate? [closed]
...bound function rather than a free function - assigning a non-static method Foo to a delegate will call this.Foo() rather than a static function as a function pointer would do ( in C, you often have an extra void* parameter to pass this to the function pointer )
– Pete Kirkham
...
How is Python's List Implemented?
...swered Oct 18 '10 at 10:39
Fred FooFred Foo
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pandas GroupBy columns with NaN (missing) values
...ngs are clubbed together. df = pd.DataFrame({'a': [1, 2, 3, 5, 6], 'b': ['foo', np.NaN, 'bar', 'foo', 'nan']}); df['b'] = df['b'].astype(str); df.groupby(['b']).sum()
– Kamaraju Kusumanchi
Aug 21 '19 at 15:14
...