diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /js/src/tests/non262/Array/from_proxy.js | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/tests/non262/Array/from_proxy.js')
-rw-r--r-- | js/src/tests/non262/Array/from_proxy.js | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/from_proxy.js b/js/src/tests/non262/Array/from_proxy.js new file mode 100644 index 0000000000..c3c82d0b7e --- /dev/null +++ b/js/src/tests/non262/Array/from_proxy.js @@ -0,0 +1,55 @@ +/* Any copyright is dedicated to the Public Domain. + * http://creativecommons.org/licenses/publicdomain/ */ + +// Two tests involving Array.from and a Proxy. +var log = []; +function LoggingProxy(target) { + var h = { + defineProperty: function (t, id) { + log.push("define", id); + return true; + }, + has: function (t, id) { + log.push("has", id); + return id in t; + }, + get: function (t, id) { + log.push("get", id); + return t[id]; + }, + set: function (t, id, v) { + log.push("set", id); + t[id] = v; + return true; + } + }; + return new Proxy(target || [], h); +} + +// When the new object created by Array.from is a Proxy, +// Array.from calls handler.defineProperty to create new elements +// but handler.set to set the length. +LoggingProxy.from = Array.from; +LoggingProxy.from([3, 4, 5]); +assertDeepEq(log, ["define", "0", "define", "1", "define", "2", "set", "length"]); + +// When the argument passed to Array.from is a Proxy, Array.from +// calls handler.get on it. +log = []; +assertDeepEq(Array.from(new LoggingProxy([3, 4, 5])), [3, 4, 5]); +assertDeepEq(log, ["get", Symbol.iterator, + "get", "length", "get", "0", + "get", "length", "get", "1", + "get", "length", "get", "2", + "get", "length"]); + +// Array-like iteration only gets the length once. +log = []; +var arr = [5, 6, 7]; +arr[Symbol.iterator] = undefined; +assertDeepEq(Array.from(new LoggingProxy(arr)), [5, 6, 7]); +assertDeepEq(log, ["get", Symbol.iterator, + "get", "length", "get", "0", "get", "1", "get", "2"]); + +if (typeof reportCompare === 'function') + reportCompare(0, 0); |