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Jan 19th, 2017
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  1. /**
  2. * Called if a parameter is missing and
  3. * the default value is evaluated.
  4. */
  5. function mandatory() {
  6. throw new Error('Missing parameter');
  7. }
  8. function foo(mustBeProvided = mandatory()) {
  9. return mustBeProvided;
  10. }
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