95145fa826
This patch moves the semantics of 'const' in sloppy mode to match those in strict mode, that is, const makes lexical (let-like) bindings, must have an initializer, and does not create properties of the global object. R=adamk LOG=Y BUG=v8:3305 CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/1571873004 Cr-Commit-Position: refs/heads/master@{#33218}
73 lines
2.5 KiB
JavaScript
73 lines
2.5 KiB
JavaScript
// Copyright 2008 the V8 project authors. All rights reserved.
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following
|
|
// disclaimer in the documentation and/or other materials provided
|
|
// with the distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived
|
|
// from this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
// Flags: --legacy-const
|
|
|
|
// Test const properties and pre/postfix operation.
|
|
function f() {
|
|
const x = 1;
|
|
x++;
|
|
assertEquals(1, x);
|
|
x--;
|
|
assertEquals(1, x);
|
|
++x;
|
|
assertEquals(1, x);
|
|
--x;
|
|
assertEquals(1, x);
|
|
assertEquals(1, x++);
|
|
assertEquals(1, x--);
|
|
assertEquals(2, ++x);
|
|
assertEquals(0, --x);
|
|
}
|
|
|
|
f();
|
|
|
|
// Test that the value is read eventhough assignment is disallowed.
|
|
// Spidermonkey does not do this, but it seems like the right thing to
|
|
// do so that 'o++' is equivalent to 'o = o + 1'.
|
|
var valueOfCount = 0;
|
|
|
|
function g() {
|
|
const o = { valueOf: function() { valueOfCount++; return 42; } };
|
|
assertEquals(42, +o);
|
|
assertEquals(1, valueOfCount);
|
|
o++;
|
|
assertEquals(42, +o);
|
|
assertEquals(3, valueOfCount);
|
|
++o;
|
|
assertEquals(42, +o);
|
|
assertEquals(5, valueOfCount);
|
|
o--;
|
|
assertEquals(42, +o);
|
|
assertEquals(7, valueOfCount);
|
|
--o;
|
|
assertEquals(42, +o);
|
|
assertEquals(9, valueOfCount);
|
|
}
|
|
|
|
g();
|