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Performing unary plus or minus, or performing arithmetic operations may
implicitly convert non-numeric values to numeric ones.
If an addition is performed and either operand is a string, the other
operand is converted into a string as well and the addition result is a
concatenated string consisting of the two operand values.
-- Expect stdout --
HelloWorld
12
34
true
false
null
{ "some": "object" }
[ "some", "array" ]
function() { ... }
1.2
Infinity
124
123
123
NaN
NaN
NaN
124.2
Infinity
1
0
0
NaN
NaN
NaN
1.2
Infinity
123
12.3
NaN
-1
0
0
NaN
NaN
NaN
-1.2
-Infinity
-123
-12.3
NaN
4.2
9.6
-- End --
-- Testcase --
{%
print(join("\n", [
// Adding two strings concatenates them:
"Hello" + "World",
// Adding a number to a string results in a string:
"1" + 2,
// Adding a string to a number results in a string:
3 + "4",
// Adding any non-string value to a string or vice versa will
// force stringification of the non-string value
"" + true,
"" + false,
"" + null,
"" + { some: "object" },
"" + [ "some", "array" ],
"" + function() {},
"" + 1.2,
"" + (1 / 0),
// Adding a numeric value to a non-string, non-numeric value
// or vice versa will convert the non-numeric argument to a
// number
123 + true,
123 + false,
123 + null,
123 + { some: "object" },
123 + [ "some", "array" ],
123 + function() {},
123 + 1.2,
123 + (1 / 0),
// The unary "+" operator follows the same logic as adding a
// non-numeric, non-string value to a numeric one. Additionally
// the unary plus forces conversion of string values into numbers
+true,
+false,
+null,
+{ some: "object" },
+[ "some", "array" ],
+function() {},
+1.2,
+(1 / 0),
+"123",
+"12.3",
+"this is not a number",
// The unary "-" operator functions like the unary "+" one and
// it additionally returns the negation of the numeric value
-true,
-false,
-null,
-{ some: "object" },
-[ "some", "array" ],
-function() {},
-1.2,
-(1 / 0),
-"123",
-"12.3",
-"this is not a number",
// Adding a double to an integer or vice versa will force the
// result to a double as well
1.2 + 3,
4 + 5.6,
"" ]));
-- End --
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