Similar to private properties in Class but in a function that uses a # to declare a variable. e.g.
function print(){
#something = getsomething(); // as if print.#something= getsomething()
console.log(something); // as if console.log(print.#something);
}
When print() is called 2nd time, #something = getsomething(); is ignored.
Use case:
In event.js library of node.js, I find that
......
if (spliceOne === undefined)
spliceOne = require('internal/util').spliceOne;
spliceOne(list, position);
......
It could be improved in this way:
#spliceOne = require('internal/util').spliceOne;
spliceOne(list, position);
The benefits is no need to declare a variable in top level and no more checking of its existence needed.