What will the following JavaScript code output?(function() { var a = b = 5;})();console.log(b);5ReferenceError: b is not definednullundefined
Question
What will the following JavaScript code output?
(function() {
var a = b = 5;
})();
console.log(b);
- 5
- ReferenceError: b is not defined
- null
- undefined
Solution
The output of the JavaScript code will be 5.
Here's the step-by-step explanation:
-
The code defines an immediately invoked function expression (IIFE) that sets
aandbto5. -
The
varkeyword only applies toa, makingaa local variable within the function. -
bis not declared withvar, so it is set as a global variable. -
After the function is executed,
ais discarded because it's local to the function, butbremains because it's global. -
When
console.log(b)is called outside of the function, it logs the global variableb, which is5.
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