michael@0: function test1() {
michael@0:     function push(arr, x) {
michael@0:         return arr.push(x);
michael@0:     }
michael@0:     var arr = [];
michael@0:     for (var i=0; i<100; i++) {
michael@0:         assertEq(push(arr, i), i + 1);
michael@0:     }
michael@0: }
michael@0: test1();
michael@0: 
michael@0: function test2() {
michael@0:     var arr;
michael@0:     for (var i=0; i<60; i++) {
michael@0:         arr = [];
michael@0:         assertEq(arr.push(3.3), 1);
michael@0:         assertEq(arr.push(undefined), 2);
michael@0:         assertEq(arr.push(true), 3);
michael@0:         assertEq(arr.push(Math), 4);
michael@0:         assertEq(arr.toString(), "3.3,,true,[object Math]");
michael@0:     }
michael@0: }
michael@0: test2();
michael@0: 
michael@0: function test3() {
michael@0:     function push(arr, v) {
michael@0:         arr.push(v);
michael@0:     }
michael@0:     for (var i=0; i<60; i++) {
michael@0:         var arr = [];
michael@0:         push(arr, null);
michael@0:         push(arr, 3.14);
michael@0:         push(arr, {});
michael@0:         assertEq(arr.toString(), ",3.14,[object Object]");
michael@0:     }
michael@0: }
michael@0: test3();