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Operator precedence with Javascript Ternary operator
...ou can't. Precedence is hard-wired into the language. That is just a fixed set of rules... However, you can change the order of evaluation...
The tool in our toolbox that can change the order of evaluation is the grouping operator (aka brackets). It does this by ensuring the expressions in the brac...
MySQL select where column is not empty
... in the phone2 field. IS NOT NULL returns everything that literally is not set to NULL, even the empty string "". !='', or <>'' as Ivan said in the accepted answer, will not return empty strings or NULL values. In other words IS NOT NULL is a subset of !='', but they are not equivalent.
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Blocks and yields in Ruby
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Yes, it is a bit puzzling at first.
In Ruby, methods may receive a code block in order to perform arbitrary segments of code.
When a method expects a block, it invokes it by calling the yield function.
This is very handy, for instance, to iterate o...
POSTing a @OneToMany sub-resource association in Spring Data REST
...or me. Just make sure the author.post is writable (for example by having a setter or @JsonValue annotation)
– scheffield
May 28 '15 at 3:14
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Read a text file using Node.js?
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
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xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false...
...e(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false”(性能警告) 1>C: Program Files (x86) Microsoft Visual Studio 11.0 VC include xtree(1796): warning C4800: int: 将值强制为布尔值true或f...1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include...
How to convert a string to number in TypeScript?
Given a string representation of a number, how can I convert it to number type in TypeScript?
17 Answers
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How do I create a unique constraint that also allows nulls?
...rver 2008
You cannot create a UNIQUE constraint and allow NULLs. You need set a default value of NEWID().
Update the existing values to NEWID() where NULL before creating the UNIQUE constraint.
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Is there a standard keyboard shortcut to build the current project in Visual Studio?
...rrent project works in VS2015 with resharper installed and keyboard scheme set to VS. It also works VS2017 without resharper.
– Kalyan
Oct 11 '17 at 15:29
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Real mouse position in canvas [duplicate]
...mouse over a HTML5 canvas, but the only way that it seems to work well is if the canvas is in the position 0,0 (upper left corner) if I change the canvas position, for some reason it doesn't draw like it should. Here is my code.
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