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Objective-C ARC: strong vs retain and weak vs assign
There are two new memory management attributes for properties introduced by ARC, strong and weak .
8 Answers
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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...数据库创建时，会触发此事件。
DatabaseDowngrade(oldVersion,newVersion)
This event fires when the database is downgraded. The previous and new version numbers are provided. Use this event to modify the database as required by the version change.
DatabaseOpened()
当数据库打...
Check if key exists and iterate the JSON array using Python
...l = function(e) {
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
...
What is the difference between currying and partial application?
...is case:
Partial applying the function Add with a value 7 will give us a new function as output. That function itself takes 1 number as input and outputs a number. As such:
Partial(Add, 7); // returns a function f2 as output
// f2 takes 1 number as input and returns a number as ...
scale Image in an UIButton to AspectFit?
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edited Mar 1 '16 at 0:51
Pang
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answered J...
How to define a preprocessor symbol in Xcode
...e Gear icon at the bottom left, and select "Add User-Defined Setting". The new setting name should be GCC_PREPROCESSOR_DEFINITIONS, and you can type your definitions in the right-hand field.
Per Steph's comments, the full syntax is:
constant_1=VALUE constant_2=VALUE
Note that you don't need the ...
How to test if parameters exist in rails
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I like how clean this is. I am new to Ruby though. Any pitfalls or missed edge cases I should know of?
– Sean
May 3 '17 at 3:13
add...
Full Screen DialogFragment in Android
...n button = (Button) findViewById(R.id.show);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog();
}
});
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
void showDi...
Generate random 5 characters string
... Brad ChristieBrad Christie
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6
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How may I reference the script tag that loaded the currently-executing script?
... This is simple and elegant. There's an example of it in the new Google Charts/Visualizations API if you unpack the javascript. They load JSON data from within the script tag, see: ajax.googleapis.com/ajax/static/modules/gviz/1.0/chart.js
– Jason Thrasher
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