Keywords convey meaning. In most programming languages, the keyword for denoting a constant is usually used just for that. So consider the following two almost-equivalent statements in JavaScript:

• const foo = (a, b) => { return a + b }
• function foo(a, b) { return a + b }

Why on Earth would one choose the former? Is it just popularity? I find the latter so much easier to read. E.g. when looking through code, by using the function keyword, I immediately realize that it is a function. When using const however, my eyes must also scan for a lambda, because people use the const keyword for pretty much everything these days.

Or is there some convincing argument to use const?