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41 File Name: 11.6.1-3.js
42 ECMA Section: 11.6.1 The addition operator ( + )
45 The addition operator either performs string concatenation or numeric
48 The production AdditiveExpression : AdditiveExpression + MultiplicativeExpression
49 is evaluated as follows:
51 1. Evaluate AdditiveExpression.
52 2. Call GetValue(Result(1)).
53 3. Evaluate MultiplicativeExpression.
54 4. Call GetValue(Result(3)).
55 5. Call ToPrimitive(Result(2)).
56 6. Call ToPrimitive(Result(4)).
57 7. If Type(Result(5)) is String or Type(Result(6)) is String, go to step 12.
58 (Note that this step differs from step 3 in the algorithm for comparison
59 for the relational operators in using or instead of and.)
60 8. Call ToNumber(Result(5)).
61 9. Call ToNumber(Result(6)).
62 10. Apply the addition operation to Result(8) and Result(9). See the discussion below (11.6.3).
63 11. Return Result(10).
64 12. Call ToString(Result(5)).
65 13. Call ToString(Result(6)).
66 14. Concatenate Result(12) followed by Result(13).
67 15. Return Result(14).
69 Note that no hint is provided in the calls to ToPrimitive in steps 5 and 6.
70 All native ECMAScript objects except Date objects handle the absence of a
71 hint as if the hint Number were given; Date objects handle the absence of a
72 hint as if the hint String were given. Host objects may handle the absence
73 of a hint in some other manner.
75 This test does only covers cases where the Additive or Mulplicative expression
78 Author: christine@netscape.com
79 Date: 12 november 1997
81 var SECTION = "11.6.1-3";
82 var VERSION = "ECMA_1";
85 writeHeaderToLog( SECTION + " The Addition operator ( + )");
87 // tests for boolean primitive, boolean object, Object object, a "MyObject" whose value is
88 // a boolean primitive and a boolean object.
90 var DATE1 = new Date();
92 new TestCase( SECTION,
93 "var DATE1 = new Date(); DATE1 + DATE1",
94 DATE1.toString() + DATE1.toString(),
97 new TestCase( SECTION,
98 "var DATE1 = new Date(); DATE1 + 0",
102 new TestCase( SECTION,
103 "var DATE1 = new Date(); DATE1 + new Number(0)",
104 DATE1.toString() + 0,
105 DATE1 + new Number(0) );
107 new TestCase( SECTION,
108 "var DATE1 = new Date(); DATE1 + true",
109 DATE1.toString() + "true",
112 new TestCase( SECTION,
113 "var DATE1 = new Date(); DATE1 + new Boolean(true)",
114 DATE1.toString() + "true",
115 DATE1 + new Boolean(true) );
117 new TestCase( SECTION,
118 "var DATE1 = new Date(); DATE1 + new Boolean(true)",
119 DATE1.toString() + "true",
120 DATE1 + new Boolean(true) );
122 var MYOB1 = new MyObject( DATE1 );
124 new TestCase( SECTION,
125 "MYOB1 = new MyObject(DATE1); MYOB1 + new Number(1)",
127 MYOB1 + new Number(1) );
129 new TestCase( SECTION,
130 "MYOB1 = new MyObject(DATE1); MYOB1 + 1",
134 new TestCase( SECTION,
135 "MYOB1 = new MyObject(DATE1); MYOB1 + true",
136 "[object Object]true",
141 function MyPrototypeObject(value) {
142 this.valueOf = new Function( "return this.value;" );
143 this.toString = new Function( "return (this.value + '');" );
146 function MyObject( value ) {
147 this.valueOf = new Function( "return this.value" );