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test_primitive_wrappers.js
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test_primitive_wrappers.js
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// Test primitive wrapper objects with SLOT_PRIMITIVE
let
passed
=
0
;
let
failed
=
0
;
function
test
(
name
,
condition
)
{
if
(
condition
)
{
console
.
log
(
'✓'
,
name
);
passed
++
;
}
else
{
console
.
log
(
'✗'
,
name
);
failed
++
;
}
}
// String wrapper
let
s
=
new
String
(
'hello'
);
test
(
'String wrapper typeof'
,
typeof
s
===
'object'
);
test
(
'String wrapper + concat'
,
s
+
' world'
===
'hello world'
);
test
(
'String wrapper length'
,
s
.
length
===
5
);
test
(
'String wrapper valueOf'
,
s
.
valueOf
()
===
'hello'
);
// Number wrapper
let
n
=
new
Number
(
42
);
test
(
'Number wrapper typeof'
,
typeof
n
===
'object'
);
test
(
'Number wrapper + arithmetic'
,
n
+
8
===
50
);
test
(
'Number wrapper valueOf'
,
n
.
valueOf
()
===
42
);
// Boolean wrapper
let
b
=
new
Boolean
(
true
);
test
(
'Boolean wrapper typeof'
,
typeof
b
===
'object'
);
test
(
'Boolean wrapper is truthy'
,
!!
b
===
true
);
test
(
'Boolean wrapper valueOf'
,
b
.
valueOf
()
===
true
);
// Object() wrapping primitives
let
wrapped
=
Object
(
'test'
);
test
(
'Object(string) is object'
,
typeof
wrapped
===
'object'
);
test
(
'Object(string) valueOf'
,
wrapped
.
valueOf
()
===
'test'
);
console
.
log
(
'\nResults:'
,
passed
,
'passed,'
,
failed
,
'failed'
);
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