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Remove an element from a Bash array
...n or discarding empty elements and has no problems with quoting/whitespace etc.
delete_ary_elmt() {
local word=$1 # the element to search for & delete
local aryref="$2[@]" # a necessary step since '${!$2[@]}' is a syntax error
local arycopy=("${!aryref}") # create a copy of the inpu...
Clang optimization levels
On gcc, the manual explains what -O3 , -Os , etc. translate to in terms of specific optimisation arguments ( -funswitch-loops , -fcompare-elim , etc.)
...
Explanation of JSONB introduced by PostgreSQL
...f JSON manipulation inside PostgreSQL, such as sorting, slicing, splicing, etc., you should use JSONB for speed reasons.
If you need indexed lookups for arbitrary key searches on JSON, then you should use JSONB.
If you are doing neither of the above, you should probably use JSON.
If you need to pres...
Const in JavaScript: when to use it and is it necessary?
...ehaviour is only applicable to Strings, Basic Types. Using Objects, Arrays etc. it is possible to change the values but it is not possible to re-assign an new "Object", e.g. const a = ["a","b"]; a = []; will throw an error otherwise it is possible
– Fer To
Feb ...
Android gradle: buildtoolsVersion vs compileSdkVersion
...sVersion is the version of the compilers (aapt, dx, renderscript compiler, etc...) that you want to use. For each API level (starting with 18), there is a matching .0.0 version.
At IO 2014, we release API 20 and build-tools 20.0.0 to go with it.
Between Android releases we will release updates of ...
How to name variables on the fly?
...e that you might be better off with a list rather than using orca1, orca2, etc, ... then it would be orca[1], orca[2], ...
Usually you're making a list of variables differentiated by nothing but a number because that number would be a convenient way to access them later.
orca <- list()
orca[1] ...
Combine multiple Collections into a single logical Collection?
...ods in the Collection interface would either have undefined semantics (add etc) or miserable performance (contains etc).
– Sean Patrick Floyd
Aug 2 '11 at 13:00
2
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In MVVM should the ViewModel or Model implement INotifyPropertyChanged?
...lowing comment: "A tire is a car accessory". Sure it is, but bikes, buses, etc. also use it. In summary, do not take that interface as an UI thing.
Having said that, it doesn't necessarily mean I believe that the Model should be providing notifications. In fact, as a rule of thumb, the model should...
Two-way encryption: I need to store passwords that can be retrieved
...ect against information disclosure vulnerabilities (XSS, remote inclusion, etc). If it gets out, the attacker can eventually crack the encryption (no encryption is 100% un-reversible without the key - As @NullUserException points out this is not entirely true. There are some encryption schemes tha...
What is the difference between XMLHttpRequest, jQuery.ajax, jQuery.post, jQuery.get
...gine that you'd have to create a whole car around it with steering, brakes etc... Car manufacturers produce completed cars, with a friendly interface (pedals, steering wheel etc.) so you don't have to do it all yourself.
sha...