Looks like JavaScript, feels like Ruby, and it is a script language fitting in C programmers.
This project is maintained by Kray-G
switch-case
statement is a multiple conditional jump.
In a condition of case
statement, you can put an expression.
If the condition’s value in case as a result is same, direct value is checked first.
Otherwise, the condition written first is checked first.
You need break
for exitting case
statement because kinx switch-case
is fallthrough.
switch (x) {
case 1:
/* ... */
break;
case 2:
/* ... */
break;
}
It is not necessary to put default
case at the bottom.
switch (x) {
case 1:
/* ... */
break;
default: /* fallthrough */
case 2:
/* ... */
break;
}
Any value is available for case
label.
switch (x) {
case 1: // Number is available
break;
case a: // variable is available
break;
case x[1]+1: // expression is available
break;
case f(): // function call is available, but calling a function will be performed every time when comparing here.
break;
}
function test(a) {
switch (a) {
case 1: return a * 2;
case 2: return a * 4;
case 3: return a * 8;
case 4: return a * 16;
default:
}
return -1;
}
0.upto(8, &(n) => System.println("%d => %3d" % n % test(n)));
0 => -1
1 => 2
2 => 8
3 => 24
4 => 64
5 => -1
6 => -1
7 => -1
8 => -1
function test(count) {
switch (count) {
default: do { System.println("%d" % count); count++;
case 0: System.println("%d" % count); count++;
case 1: System.println("%d" % count); count++;
case 2: System.println("%d" % count); count++;
} while (count < 8);
}
}
test(2);
2
3
4
5
6
7
8
9
10
function f() {
return "a4";
}
function test(a) {
var x = [1, 1.2, "a2", "a"];
switch (a) {
case "a1": return 2;
case x[-2]: return 4;
case x[3]+"3": return 8;
case f(): return 16;
default:
}
return -1;
}
0.upto(8, &(n) => System.println("%d => %3d" % n % test("a" + n)));
0 => -1
1 => 2
2 => 4
3 => 8
4 => 16
5 => -1
6 => -1
7 => -1
8 => -1
var array = [1,2,3,4,5,6,7,8,9,10];
function switchTest(n) {
switch (n) {
case 1: System.println(n); break;
case 2: System.println(n); break;
case 3: System.println(n); break;
case 4: System.println(n); break;
case 5: System.println(n); break;
case 6: System.println(n); break;
case 7: System.println(n); break;
case 8: System.println(n); break;
default:
System.print("default - ");
// fallthrough
case 100: System.println(n); break;
break;
case array.length():
System.println("array-length:%{n}");
break;
case "aaa":
System.println(n);
break;
case "bbb":
System.println(n);
break;
}
}
0.upto(100, function(i) {
if (12 < i && i <= 97) {
return; // omitted.
}
System.print("%{i} => ");
switchTest(i);
});
0 => default - 0
1 => 1
2 => 2
3 => 3
4 => 4
5 => 5
6 => 6
7 => 7
8 => 8
9 => default - 9
10 => array-length:10
11 => default - 11
12 => default - 12
98 => default - 98
99 => default - 99
100 => 100