how to access variable outside function in javascript

; Why does the expression weirdObject.prop-3 evaluate to NaN?Please write your answer in a comment below! Now that we have established that a function can be stored in (actually, assigned to) a variable, these variables can be passed as parameters to another function. // Example 4 var a = getValue; var b = a; // b is now a reference to getValue. Global Variables are the variables that can be accessed from anywhere in the program. All JavaScript variables must be identified with unique names. 2. The above answered why you were getting undefined when calling getUser(), but if you want to work with the end result you also want to change how you're using the value you get from getUser - it returns a promise object, not the end result you're after, so your code wants to call the promise's then method when the promise gets resolved: variable You need to run the following code to learn how to return a value −. If you need something outside of a function, you want to return it and store that in a variable. There are two ways to declare a variable globally: Declare a variable outside the functions. JavaScript Callbacks Variable Scope function toCelsius(fahrenheit) return (5/9) * (fahrenheit-32);} … If you forget to code the var keyword in a variable declaration, the JavaScript engine assumes that the variable is global. JavaScript global variable - javatpoint But I'm going to show you a use case where function scoping sort of comes back and bites us. The nested function can access all variables, functions & arguments defined in the containing function. The mrFrontendMethods Object; The getTitle method; These things are public because they are returned by the return statement. The let keyword is similar to the var keyword, except that these variables are blocked-scope. how to access variable outside function in javascript

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