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Better way to get type of a Javascript variable?
...[object Array]' : 'array',
'[object Date]' : 'date',
'[object Error]' : 'error'
},
TOSTRING = Object.prototype.toString;
function type(o) {
return TYPES[typeof o] || TYPES[TOSTRING.call(o)] || (o ? 'object' : 'null');
};
This captures many of the primitives provided by javascri...
How to write log to file
....O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
if err != nil {
log.Fatalf("error opening file: %v", err)
}
defer f.Close()
log.SetOutput(f)
log.Println("This is a test log entry")
Based on the Go docs, os.Open() can't work for log.SetOutput, because it opens the file "for reading:"
func Open
...
How can I remove an element from a list?
...it documentation for R on how to remove elements from lists, but trial and error tells me
myList[[5]] <- NULL
will remove the 5th element and then "close up" the hole caused by deletion of that element. That suffles the index values, So I have to be careful in dropping elements. I must ...
How do I get the number of elements in a list?
...objects with a "size" in Python, in particular, have an attribute called ob_size, where the number of elements in the object is cached. So checking the number of objects in a list is very fast.
But if you're checking if list size is zero or not, don't use len - instead, put the list in a boolean co...
How can I format my grep output to show line numbers at the end of the line, and also the hit count?
...
your solution seems fine but get an error awk95: syntax error at source line context is >>> ' <<< missing } awk95: bailing out at source line 1
– London
Oct 19 '10 at 12:27
...
Set a default parameter value for a JavaScript function
...
@SiPlus and you got extra reference errors for free of charge while trying to use undefined objects :p Even while it may work with some browsers and might be faster, null is still an object and undefined is reference to primitive type that is trying to tell tha...
What do ellipsis […] mean in a list?
...'t been able to understand this. Tried to run these commands but there are errors.
– Aseem Bansal
Jun 19 '13 at 5:17
@...
How to Apply Gradient to background view of iOS Swift App
...
I'm getting this error fatal error: array element cannot be bridged to Objective-C, when assigning to .colors property. What may be wrong with this?
– Tricertops
Jul 20 '14 at 19:10
...
Difference between method and function in Scala
... example:
scala> val f = () => { return "test" }
<console>:4: error: return outside method definition
val f = () => { return "test" }
^
Returning from a function defined in a method does a non-local return:
scala> def f: String = { ...
List goals/targets in GNU make that contain variables in their definition
...s, putting it in double quotes, but it just results in awk having a syntax error on the first comma... any thoughts on how to correctly escape this for a shell (bash) alias?
– drfrogsplat
Oct 25 '12 at 2:06
...