ladybird/Libraries/LibJS/Tests/builtins/JSON/JSON.stringify-replacer.js

test("basic functionality", () => {
  let o = {
    var1: "foo",
    var2: 42,
    arr: [
      1,
      2,
      {
        nested: {
          hello: "world",
        },
        get x() {
          return 10;
        },
      },
    ],
    obj: {
      subarr: [3],
    },
  };

  let string = JSON.stringify(o, (key, value) => {
    if (key === "hello") return undefined;
    if (value === 10) return 20;
    if (key === "subarr") return [3, 4, 5];
    return value;
  });

  expect(string).toBe(
    '{"var1":"foo","var2":42,"arr":[1,2,{"nested":{},"x":20}],"obj":{"subarr":[3,4,5]}}'
  );

  string = JSON.stringify(o, ["var1", "var1", "var2", "obj"]);
  expect(string).toBe('{"var1":"foo","var2":42,"obj":{}}');

  string = JSON.stringify(o, ["var1", "var1", "var2", "obj", "subarr"]);
  expect(string).toBe('{"var1":"foo","var2":42,"obj":{"subarr":[3]}}');
});