ladybird/Libraries/LibJS/Tests/functions/function-default-parameters.js

load("test-common.js");

try {
  function func1(a, b = 1) {
    return a + b;
  }

  const arrowFunc1 = (a, b = 1) => a + b;

  assert(func1(4, 5) === 9);
  assert(func1(4) === 5);
  assert(func1(4, undefined) === 5);
  assert(Number.isNaN(func1()));

  assert(arrowFunc1(4, 5) === 9);
  assert(arrowFunc1(4) === 5);
  assert(arrowFunc1(4, undefined) === 5);
  assert(Number.isNaN(arrowFunc1()));

  function func2(a = 6) {
    return typeof a;
  }

  const arrowFunc2 = (a = 6) => typeof a;

  assert(func2() === "number");
  assert(func2(5) === "number");
  assert(func2(undefined) === "number");
  assert(func2(false) === "boolean");
  assert(func2(null) === "object");
  assert(func2({}) === "object");

  assert(arrowFunc2() === "number");
  assert(arrowFunc2(5) === "number");
  assert(arrowFunc2(undefined) === "number");
  assert(arrowFunc2(false) === "boolean");
  assert(arrowFunc2(null) === "object");
  assert(arrowFunc2({}) === "object");

  function func3(a = 5, b) {
    return a + b;
  }

  const arrowFunc3 = (a = 5, b) => a + b;

  assert(func3(4, 5) === 9);
  assert(func3(undefined, 4) === 9);
  assert(Number.isNaN(func3()));

  assert(arrowFunc3(4, 5) === 9);
  assert(arrowFunc3(undefined, 4) === 9);
  assert(Number.isNaN(arrowFunc3()));

  function func4(a, b = a) {
    return a + b;
  }

  const arrowFunc4 = (a, b = a) => a + b;

  assert(func4(4, 5) === 9);
  assert(func4(4) === 8);
  assert(func4("hf") === "hfhf");
  assert(func4(true) === 2);
  assert(Number.isNaN(func4()));

  assert(arrowFunc4(4, 5) === 9);
  assert(arrowFunc4(4) === 8);
  assert(arrowFunc4("hf") === "hfhf");
  assert(arrowFunc4(true) === 2);
  assert(Number.isNaN(arrowFunc4()));

  function func5(
    a = function () {
      return 5;
    }
  ) {
    return a();
  }

  const arrowFunc5 = (
    a = function () {
      return 5;
    }
  ) => a();

  assert(func5() === 5);
  assert(
    func5(function () {
      return 10;
    }) === 10
  );
  assert(func5(() => 10) === 10);
  assert(arrowFunc5() === 5);
  assert(
    arrowFunc5(function () {
      return 10;
    }) === 10
  );
  assert(arrowFunc5(() => 10) === 10);

  function func6(a = () => 5) {
    return a();
  }

  const arrowFunc6 = (a = () => 5) => a();

  assert(func6() === 5);
  assert(
    func6(function () {
      return 10;
    }) === 10
  );
  assert(func6(() => 10) === 10);
  assert(arrowFunc6() === 5);
  assert(
    arrowFunc6(function () {
      return 10;
    }) === 10
  );
  assert(arrowFunc6(() => 10) === 10);

  function func7(a = { foo: "bar" }) {
    return a.foo;
  }

  const arrowFunc7 = (a = { foo: "bar" }) => a.foo;

  assert(func7() === "bar");
  assert(func7({ foo: "baz" }) === "baz");
  assert(arrowFunc7() === "bar");
  assert(arrowFunc7({ foo: "baz" }) === "baz");

  console.log("PASS");
} catch (e) {
  console.log("FAIL: " + e);
}