What is the difference between call and apply?

tl;dr

The difference between call and apply in Javascript is that call takes in arguments one by one, while apply takes in arguments as an array.

For example, if we have a function add that takes in two arguments, a and b, we can call it using call like this:

add.call(this, a, b);

Or we can call it using apply like this:

add.apply(this, [a, b]);

In both cases, the function add will be called with the arguments a and b. The difference is that call takes in the arguments one by one, while apply takes in the arguments as an array.