Terse Configurable Functions

The powerful function configuration methods from the reusable charts design pattern are verbose, but their syntax can be condensed down to a one-liner by combining ES6 arrow functions, ternary operators, expression grouping, and the underscore variable convention for variadic functions. Note that this example will not work in Internet Explorer 11 or below.

Original syntax:

some_function.x = function(value) {
  if (!arguments.length) {
    return x;
  } else {
    x = value;
    return some_function;
  }
};

Condensed:

some_function.x = _ => _ !== undefined ? (x = _, some_function) : x;

This is a dense line of code, but brevity is beneficial here since this is an attempt to replace traditional function arguments with a more powerful semantic alternative.