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How to check if a json key exists?
So, I get some JSON values from the server but I don't know if there will be a particular field or not.
13 Answers
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Why is it considered a bad practice to omit curly braces? [closed]
...t's ever really bit me was when I was debugging, and commented out bar():
if(foo)
// bar();
doSomethingElse();
Other than that, I tend to use:
if(foo) bar();
Which takes care of the above case.
EDIT Thanks for clarifying the question, I agree, we should not write code to the lowest common d...
jQuery: Test if checkbox is NOT checked
...
One reliable way I use is:
if($("#checkSurfaceEnvironment-1").prop('checked') == true){
//do something
}
If you want to iterate over checked elements use the parent element
$("#parentId").find("checkbox").each(function(){
if ($(this).prop('c...
Are “elseif” and “else if” completely synonymous?
Are elseif and else if completely synonymous, or is there a difference?
2 Answers
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How to check if a file exists from inside a batch file [duplicate]
I need to run a utility only if a certain file exists. How do I do this in Windows batch?
3 Answers
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Pythonic way to check if a file exists? [duplicate]
Which is the preferred way to check if a file exists and if not create it?
5 Answers
5...
Check if multiple strings exist in another string
How can I check if any of the strings in an array exists in another string?
15 Answers
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How to detect my browser version and operating system using JavaScript?
...set,ix;
// In Opera, the true version is after "Opera" or after "Version"
if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
browserName = "Opera";
fullVersion = nAgt.substring(verOffset+6);
if ((verOffset=nAgt.indexOf("Version"))!=-1)
fullVersion = nAgt.substring(verOffset+8);
}
// In MSIE, the t...
Javascript: How to check if a string is empty? [duplicate]
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I check length.
if (str.length == 0) {
}
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Is “else if” faster than “switch() case”? [duplicate]
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For just a few items, the difference is small. If you have many items you should definitely use a switch.
If a switch contains more than five items, it's implemented using a lookup table or a hash list. This means that all items get the same access ti...