5 Questions
What happens if you assign a value to a variable that has not been declared in JavaScript?
It becomes a global variable
Which keyword in JavaScript does create a property on the global window object?
var
In which mode does all modern browsers support running JavaScript?
Strict mode
When does the lifetime of a JavaScript variable start?
When it is declared
What happens to global variables in a web browser when you close the browser window?
They are deleted
Test your knowledge about JavaScript scope and the introduction of block scope with the let and const keywords in ES6. Learn about the differences between global scope, function scope, and block scope in JavaScript variables.
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