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How do I check if an object has a key in JavaScript? [duplicate]
...the inverse.
if (!('key' in myObj))
Be careful! The in operator matches all object keys, including those in the object's prototype chain.
Use myObj.hasOwnProperty('key') to check an object's own keys and will only return true if key is available on myObj directly:
myObj.hasOwnProperty('key')
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Delete a line in Eclipse
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Ctrl + D
From Help->Key Assist... there are all kinds of useful keyboard shortcuts for Eclipse.
For Mac users: ⌘ + D
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What's the use of do while(0) when we define a macro? [duplicate]
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As Amo said, it's a clever trick that allows a macro to be a C statement that must end with a semicolon. It makes the macro act exactly like a function call, so far as statement construction and termination (with ';') is concerned.
– Eddie
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What is an MDF file? [closed]
... See wikipedia. A database may also use secondary database file, which normally uses a .ndf extension.
As John S. indicates, these file extensions are purely convention - you can use whatever you want, although I can't think of a good reason to do that.
More info on MSDN here and in Beginning SQL ...
Tools for creating Class Diagrams [closed]
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Experimenting it and it's really nice and clean! The login is pretty straight forward with g+ account. +1 for sure! :)
– Ian Medeiros
Apr 4 '13 at 18:25
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How to create new folder? [duplicate]
...xists(newpath):
os.makedirs(newpath)
If you're trying to make an installer: Windows Installer does a lot of work for you.
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Oracle SQL, concatenate multiple columns + add text
So I basically wanna display this (whole row in ONE column):
6 Answers
6
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How can I beautify JSON programmatically? [duplicate]
...rowsers.
Manual formatting solution
If you don't need to do it programmatically, Try JSON Lint. Not only will it prettify your JSON, it will validate it at the same time.
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Remove the cell highlight color of UITableView
...layed in it or handling it's interaction. Check to make sure you are have all proper registration set and aren't overriding other functions.
– Michael
Apr 23 '19 at 14:23
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How to loop through key/value object in Javascript? [duplicate]
...check for this by using the object's hasOwnProperty() method. This is generally a good idea when using for...in loops:
var user = {};
function setUsers(data) {
for (var k in data) {
if (data.hasOwnProperty(k)) {
user[k] = data[k];
}
}
}
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