29 lines
419 B
JavaScript
29 lines
419 B
JavaScript
class ChainA {
|
|
foo() {
|
|
return 'A';
|
|
}
|
|
}
|
|
|
|
class ChainB extends ChainA {
|
|
foo() {
|
|
return super.foo() + ' B';
|
|
}
|
|
}
|
|
|
|
class ChainC extends ChainB {
|
|
foo() {
|
|
return super.foo() + ' C';
|
|
}
|
|
}
|
|
|
|
class ChainD extends ChainC {
|
|
foo() {
|
|
return super.foo() + ' D';
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
var d = new ChainD();
|
|
assert.equal('A B C D', d.foo());
|