How can I check whether a variable is defined in JavaScript?
80608
JavaScript check if variable exists (is defined/initialized)
6282
How do I check if a string is a number (float)?
62907
javascript variable that contains
35455
How to detect if JavaScript is disabled?
44112
"Variable" variables in Javascript?
80361
Any program or trick to find the definition of a variable?
55996
How can I know if a node is already defined?
5307
Check if a variable is in an ad-hoc list of values
30987
How to tell if a JavaScript function is defined
105797
Why can't we define a variable inside an if statement?
15233
Event handler scope in Javascript
576
How can I check for an empty/undefined/null string in JavaScript?
157279
How do you check if a variable is an array in JavaScript?
12945
Finding the variable name passed to a function
5451
How do I check if an element is hidden in jQuery?
87568
How to find where a method is defined at runtime?
39705
Is there a way to access a javascript variable using a string that contains the name of the variable?