michael@0: var arr = [0,1,,3,4];
michael@0: Object.prototype[2] = 2;
michael@0: 
michael@0: assertEq(arr.join(""), "01234");
michael@0: assertEq(arr.join(","), "0,1,2,3,4");
michael@0: 
michael@0: arr[2] = "porkchops";
michael@0: assertEq(arr.join("*"), "0*1*porkchops*3*4");
michael@0: 
michael@0: delete Object.prototype[2];
michael@0: assertEq(arr.join("*"), "0*1*porkchops*3*4");
michael@0: 
michael@0: delete arr[2];
michael@0: assertEq(arr.join("*"), "0*1**3*4");
michael@0: 
michael@0: Object.prototype[2] = null;
michael@0: assertEq(arr.join("*"), "0*1**3*4");
michael@0: Object.prototype[2] = undefined;
michael@0: assertEq(arr.join("*"), "0*1**3*4");
michael@0: arr[2] = null;
michael@0: assertEq(arr.join("*"), "0*1**3*4");
michael@0: arr[2] = undefined;
michael@0: assertEq(arr.join("*"), "0*1**3*4");
michael@0: 
michael@0: var arr = new Array(10);
michael@0: assertEq(arr.join(""), "");
michael@0: assertEq(arr.join(), ",,,,,,,,,");
michael@0: assertEq(arr.join("|"), "|||||||||");
michael@0: 
michael@0: arr[2] = "doubt";
michael@0: assertEq(arr.join(","), ",,doubt,,,,,,,");
michael@0: 
michael@0: arr[9] = "failure";
michael@0: assertEq(arr.join(","), ",,doubt,,,,,,,failure");
michael@0: 
michael@0: delete arr[2];
michael@0: assertEq(arr.join(","), ",,,,,,,,,failure");
michael@0: 
michael@0: reportCompare(true, true);