src/third_party/mozjs-45/js/src/tests/ecma_6/Symbol/json-stringify-values.js

/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/licenses/publicdomain/ */

// To JSON.stringify, symbols are the same as undefined.

var symbols = [
    Symbol(),
    Symbol.for("ponies"),
    Symbol.iterator
];

for (var sym of symbols) {
    assertEq(JSON.stringify(sym), undefined);
    assertEq(JSON.stringify([sym]), "[null]");

    // JSON.stringify skips symbol-valued properties!
    assertEq(JSON.stringify({x: sym}), '{}');

    // However such properties are passed to the replacerFunction if any.
    var replacer = function (key, val) {
        assertEq(typeof this, "object");
        if (typeof val === "symbol") {
            assertEq(val, sym);
            return "ding";
        }
        return val;
    };
    assertEq(JSON.stringify(sym, replacer), '"ding"');
    assertEq(JSON.stringify({x: sym}, replacer), '{"x":"ding"}');
}

if (typeof reportCompare === 'function')
    reportCompare(0, 0, 'ok');