text: // Copyright 2016 the V8 project authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  (function testBasic() {
    var stack = [];
    var object = {a: false};
    var replaced = {a: false, replaced: true};
  
    function replacer(key, value) {
      stack.push({ holder: this, key, value });
      if (stack.length === 1) return replaced;
      if (key === "a") return true;
      return value;
    }
  
    assertEquals(`{"a":true,"replaced":true}`, JSON.stringify(object, replacer));
  
    assertEquals([
      {
        holder: { "": { a: false } },
        key: "",
        value: { a: false }
      },
      {
        holder: { a: false, replaced: true },
        key: "a",
        value: false
      },
      {
        holder: { a: false, replaced: true },
        key: "replaced",
        value: true
      }
    ], stack);
  
    assertSame(stack[0].holder[""], object);
    assertSame(stack[0].value, object);
    assertSame(stack[1].holder, replaced);
    assertSame(stack[2].holder, replaced);
  })();
  
  (function testToJSON() {
    var stack = [];
    var object = {a: false, toJSON };
    var nested = { toJSON: nestedToJSON };
    var replaced = {a: false, replaced: true, nested };
    var toJSONd = {a: false, toJSONd: true }
    var nestedToJSONd = { nestedToJSONd: true };
  
    function toJSON(key, value) {
      return toJSONd;
    }
  
    function nestedToJSON(key, value) {
      return nestedToJSONd;
    }
  
    function replacer(key, value) {
      stack.push({ holder: this, key, value });
      if (stack.length === 1) return replaced;
      if (key === "a") return true;
      return value;
    }
  
    assertEquals(`{"a":true,"replaced":true,"nested":{"nestedToJSONd":true}}`,
                 JSON.stringify(object, replacer));
  
    assertEquals([
      {
        holder: { "": { a: false, toJSON: toJSON } },
        key: "",
        value: { a: false, toJSONd: true }
      },
      {
        holder: { a: false, replaced: true, nested: { toJSON: nestedToJSON } },
        key: "a",
        value: false
      },
      {
        holder: { a: false, replaced: true, nested: { toJSON: nestedToJSON } },
        key: "replaced",
        value: true
      },
      {
        holder: { a: false, replaced: true, nested: { toJSON: nestedToJSON } },
        key: "nested",
        value: { nestedToJSONd: true }
      },
      {
        holder: { nestedToJSONd: true },
        key: "nestedToJSONd",
        value: true
      }
    ], stack);
  
    assertSame(stack[0].holder[""], object);
    assertSame(stack[0].value, toJSONd);
    assertSame(stack[1].holder, replaced);
    assertSame(stack[2].holder, replaced);
    assertSame(stack[3].holder, replaced);
    assertSame(stack[3].value, nestedToJSONd);
    assertSame(stack[4].holder, nestedToJSONd);
  })();
  