v8/test/mjsunit/const-declaration.js

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// Copyright 2009 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.
// Test handling of const variables in various settings.
(function () {
function f() {
function g() {
x = 42; // should be ignored
return x; // force x into context
}
x = 43; // should be ignored
assertEquals(undefined, g());
x = 44; // should be ignored
const x = 0;
x = 45; // should be ignored
assertEquals(0, g());
}
f();
})();
(function () {
function f() {
function g() {
with ({foo: 0}) {
x = 42; // should be ignored
return x; // force x into context
}
}
x = 43; // should be ignored
assertEquals(undefined, g());
x = 44; // should be ignored
const x = 0;
x = 45; // should be ignored
assertEquals(0, g());
}
f();
})();
(function () {
function f() {
function g(s) {
eval(s);
return x; // force x into context
}
x = 43; // should be ignored
assertEquals(undefined, g("x = 42;"));
x = 44; // should be ignored
const x = 0;
x = 45; // should be ignored
assertEquals(0, g("x = 46;"));
}
f();
})();
(function () {
function f() {
function g(s) {
with ({foo: 0}) {
eval(s);
return x; // force x into context
}
}
x = 43; // should be ignored
assertEquals(undefined, g("x = 42;"));
x = 44; // should be ignored
const x = 0;
x = 45; // should be ignored
assertEquals(0, g("x = 46;"));
}
f();
})();
(function () {
function f(s) {
function g() {
x = 42; // assign to global x, or to const x
return x;
}
x = 43; // declare global x
assertEquals(42, g());
x = 44; // assign to global x
eval(s);
x = 45; // should be ignored (assign to const x)
assertEquals(0, g());
}
f("const x = 0;");
})();
(function () {
function f(s) {
function g() {
with ({foo: 0}) {
x = 42; // assign to global x, or to const x
return x;
}
}
x = 43; // declare global x
assertEquals(42, g());
x = 44; // assign to global x
eval(s);
x = 45; // should be ignored (assign to const x)
assertEquals(0, g());
}
f("const x = 0;");
})();
(function () {
function f(s) {
function g(s) {
eval(s);
return x;
}
x = 43; // declare global x
assertEquals(42, g("x = 42;"));
x = 44; // assign to global x
eval(s);
x = 45; // should be ignored (assign to const x)
assertEquals(0, g("x = 46;"));
}
f("const x = 0;");
})();
(function () {
function f(s) {
function g(s) {
with ({foo: 0}) {
eval(s);
return x;
}
}
x = 43; // declare global x
assertEquals(42, g("x = 42;"));
x = 44; // assign to global x
eval(s);
x = 45; // should be ignored (assign to const x)
assertEquals(0, g("x = 46;"));
}
f("const x = 0;");
})();