A closure is a function that has access to variables in its outer scope, even after the outer function has returned. It allows developers to create private variables and functions that cannot be accessed from outside the function.
Synchronous code is executed in a single thread, with each statement executed in order. Asynchronous code, on the other hand, allows multiple statements to be executed simultaneously, without blocking the execution of other code.
Event bubbling is a mechanism in which events propagate through the DOM hierarchy from the innermost element to the outermost element. This means that when an event occurs on an element, it will also trigger the same event on all of its parent elements.
Both call and apply are used to invoke a function with a specified this value, but they differ in how they accept arguments. Call accepts arguments as a comma-separated list, while apply accepts arguments as an array.
Both let and var are used to declare variables, but they differ in their scoping rules. Variables declared with var have function scope, while variables declared with let have block scope.
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