1 /** 2 File Name: expression-001.js 3 Corresponds to: ecma/Expressions/11.12-2-n.js 4 ECMA Section: 11.12 5 Description: 6 7 The grammar for a ConditionalExpression in ECMAScript is a little bit 8 different from that in C and Java, which each allow the second 9 subexpression to be an Expression but restrict the third expression to 10 be a ConditionalExpression. The motivation for this difference in 11 ECMAScript is to allow an assignment expression to be governed by either 12 arm of a conditional and to eliminate the confusing and fairly useless 13 case of a comma expression as the center expression. 14 15 Author: christine (at) netscape.com 16 Date: 09 september 1998 17 */ 18 var SECTION = "expression-001"; 19 var VERSION = "JS1_4"; 20 var TITLE = "Conditional operator ( ? : )" 21 startTest(); 22 writeHeaderToLog( SECTION + " " + TITLE ); 23 24 var tc = 0; 25 var testcases = new Array(); 26 27 // the following expression should be an error in JS. 28 29 var result = "Failed" 30 var exception = "No exception was thrown"; 31 32 try { 33 eval("var MY_VAR = true ? \"EXPR1\", \"EXPR2\" : \"EXPR3\""); 34 } catch ( e ) { 35 result = "Passed"; 36 exception = e.toString(); 37 } 38 39 testcases[tc++] = new TestCase( 40 SECTION, 41 "comma expression in a conditional statement "+ 42 "(threw "+ exception +")", 43 "Passed", 44 result ); 45 46 47 test(); 48
