v8/test/mjsunit/compiler/countoperation.js

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// Test pre- and postfix count operations.

// Test value context.
var a = 42;
var b = {x:42};
var c = "x";
assertEquals(43, ++a);
assertEquals(43, a);
assertEquals(43, a++);
assertEquals(44, a);
assertEquals(43, ++b.x);
assertEquals(43, b.x);
assertEquals(43, b.x++);
assertEquals(44, b.x);
assertEquals(45, ++b[c]);
assertEquals(45, b[c]);
assertEquals(45, b[c]++);
assertEquals(46, b[c]);

// Test effect context.
a = 42;
b = {x:42};
c = "x";
assertEquals(1, eval("++a; 1"));
assertEquals(43, a);
assertEquals(1, eval("a++; 1"));
assertEquals(44, a);
assertEquals(1, eval("++b.x; 1"));
assertEquals(43, b.x);
assertEquals(1, eval("b.x++; 1"));
assertEquals(44, b.x);
assertEquals(1, eval("++b[c]; 1"));
assertEquals(45, b[c]);
assertEquals(1, eval("b[c]++; 1"));
assertEquals(46, b[c]);

// Test test context.
a = 42;
b = {x:42};
c = "x";
assertEquals(1, (++a) ? 1 : 0);
assertEquals(43, a);
assertEquals(1, (a++) ? 1 : 0);
assertEquals(44, a);
assertEquals(1, (++b.x) ? 1 : 0);
assertEquals(43, b.x);
assertEquals(1, (b.x++) ? 1 : 0);
assertEquals(44, b.x);
assertEquals(1, (++b[c]) ? 1 : 0);
assertEquals(45, b[c]);
assertEquals(1, (b[c]++) ? 1 : 0);
assertEquals(46, b[c]);

// Test value/test and test/value contexts.
a = 42;
b = {x:42};
c = "x";
assertEquals(43, ++a || 1);
assertEquals(43, a);
assertEquals(43, a++ || 1);
assertEquals(44, a);
assertEquals(43, ++b.x || 1);
assertEquals(43, b.x);
assertEquals(43, (b.x++) || 1);
assertEquals(44, b.x);
assertEquals(45, ++b[c] || 1);
assertEquals(45, b[c]);
assertEquals(45, b[c]++ || 1);
assertEquals(46, b[c]);
a = 42;
b = {x:42};
c = "x";
assertEquals(1, ++a && 1);
assertEquals(43, a);
assertEquals(1, a++ && 1);
assertEquals(44, a);
assertEquals(1, ++b.x && 1);
assertEquals(43, b.x);
assertEquals(1, (b.x++) && 1);
assertEquals(44, b.x);
assertEquals(1, ++b[c] && 1);
assertEquals(45, b[c]);
assertEquals(1, b[c]++ && 1);
assertEquals(46, b[c]);

// Test count operations with parameters.
function f(x) { x++; return x; }
assertEquals(43, f(42));

function g(x) { ++x; return x; }
assertEquals(43, g(42));

function h(x) { var y = x++; return y; }
assertEquals(42, h(42));

function k(x) { var y = ++x; return y; }
assertEquals(43, k(42));

// Test count operation in a test context.
function countTestPost(i) { var k = 0; while (i--) { k++; } return k; }
assertEquals(10, countTestPost(10));

function countTestPre(i) { var k = 0; while (--i) { k++; } return k; }
assertEquals(9, countTestPre(10));