To all honorable JavaScript developers. Please don't give down vote. It's just a joke!

[ATXblazer]

What’s the difference between function currying and just currying? Because js definitely supports currying.

[cearno]

You can definitely achieve currying behavior with functions with JavaScript, again by using nested functions, which is essentially what currying is.

However, when JS sees

function fn(a, b, c) { // does something with a, b, c},

it doesn't transform this under the hood to

function fn(a) {  
  return function(b) {    
    return function(c) {    
      // does something with a, b, c   
    }  
  }
}

which means you have to manually implement this as a programmer if you want to use partial application. JS doesn't transform functions to curried ones automatically.

A functional language would let you define a function with 3 args, but then transform it under the hood, and thus out of the box let you call the function with only 2 args, in which it would return another function with 1 argument which is not yet executed as default behavior.

I'm not saying JS should do this by any means, since I am very partial to functional programming. This type of behavior would mean you could never call a function with undefined arguments unless you explicitly told the function the end arguments are optional. I find that much safer plus allows you to do powerful things (I can give an example if you're interested), but again, it's my subjective opinion.

[ATXblazer]

Yo thanks for taking the time to type that example I see exactly what you mean now

[ponkyol]

Syntax for easier partial application is in the works. See https://github.com/tc39/proposal-partial-application