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// context based, functional? :-(
function foo() {
  const format = (name) => name.toUpperCase();
  const mapper = (item) => format(item);
  ['foo', 'bar'].map(mapper);
}

// no context based, functional! :-)
function bar() {
  const format = (name) => name.toUpperCase();
  const mapper = (fn) => (item) => fn(item);
  ['foo', 'bar'].map(mapper(format));
}