How to declare a variable in JavaScript? Similar to other programming languages, creating a variable is called as "Declaring"a variablein JavaScript. In addition to this, the declaration of the variable happens with the help of the "var" keyword. Example vartest; where thetestis the name of ...
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Typically you only want your condition to evaluate to true when your "boolean" variable,varin this example, is explicitly set to true. All the others cases are dangerously misleading! The last case (#5) is especially naughty because it will execute the command contained in the variable (which...
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Creating anarrayin JavaScript is easy. We create an array using thevarkeyword. It is similar to the way we create an Array usingArrayListin Java. Java insists on specifying the data type of theArrayList. But in JavaScript, we do not explicitly declare the data type of the Array. We let...
It would be great if it would allow me to import a package into a namespace of my choice, not just the global namespace... sigh, but that's besides the point. It allows you to declare the namespace then define objects/modules in that namespace: Namespace('my.awesome.package'); my...
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I tried to declare a Boolean variable in a shell script using the following syntax: variable=$false variable=$true Is this correct? Also, if I wanted to update that variable would I use the same syntax? Finally, is the following syntax for using Boolean variables as expressions cor...
What does "undefined" mean in JavaScript? When a user does not assign a value to a variable, it is of type undefined. The undefined type is a primitive type that contains only a single value, i.e., undefined. When users declare a variable but do not initialize it, i.e., it means...
When you use the typeof operator in JavaScript to check if a data type is a number, you might notice that it considers “NaN” to be a “number“. You can check this behavior by looking at the following example. We intentionally declare a variable called “number” and set it to the...