src/v8/test/mjsunit/boolean.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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assertEquals(Boolean(void 0), false);
assertEquals(Boolean(null), false);
assertEquals(Boolean(false), false);
assertEquals(Boolean(true), true);
assertEquals(Boolean(0), false);
assertEquals(Boolean(1), true);
assertEquals(Boolean(assertEquals), true);
assertEquals(Boolean(new Object()), true);
assertTrue(new Boolean(false) !== false);
assertTrue(new Boolean(false) == false);
assertTrue(new Boolean(true) !== true);
assertTrue(new Boolean(true) == true);

assertEquals(true, !false);
assertEquals(false, !true);
assertEquals(true, !!true);
assertEquals(false, !!false);

assertEquals(true, true ? true : false);
assertEquals(false, false ? true : false);

assertEquals(false, true ? false : true);
assertEquals(true, false ? false : true);


assertEquals(true, true && true);
assertEquals(false, true && false);
assertEquals(false, false && true);
assertEquals(false, false && false);

// Regression.
var t = 42;
assertEquals(void 0, t.p);
assertEquals(void 0, t.p && true);
assertEquals(void 0, t.p && false);
assertEquals(void 0, t.p && (t.p == 0));
assertEquals(void 0, t.p && (t.p == null));
assertEquals(void 0, t.p && (t.p == t.p));

var o = new Object();
o.p = 'foo';
assertEquals('foo', o.p);
assertEquals('foo', o.p || true);
assertEquals('foo', o.p || false);
assertEquals('foo', o.p || (o.p == 0));
assertEquals('foo', o.p || (o.p == null));
assertEquals('foo', o.p || (o.p == o.p));

// JSToBoolean(x:string)
function f(x) { return !!("" + x); }
assertEquals(false, f(""));
assertEquals(true, f("narf"));
assertEquals(true, f(12345678));
assertEquals(true, f(undefined));