-
Notifications
You must be signed in to change notification settings - Fork 0
/
classes.js
57 lines (42 loc) · 1.21 KB
/
classes.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
// old way to create class
// method that return a new range obj
function range(from, to) {
let r = Object.create(range.methods);
r.from = from;
r.to = to;
return r;
}
// This prototype object defines methods inherited by all range objects.
range.methods = {
includes(x) { return this.from <= x && x <= this.to; },
*[Symbol.iterator]() {
for(let x = Math.ceil(this.from); x <= this.to; x++) yield x;
},
toString() { return "(" + this.from + "..." + this.to + ")"; }
};
const r1 = range(1,3)
// using constructor
function Range(from, to) {
this.from = from;
this.to = to;
}
Range.prototype = {
includes: function(x) { return this.from <= x && x <= this.to; },
[Symbol.iterator]: function*() {
for(let x = Math.ceil(this.from); x <= this.to; x++) yield x;
},
toString: function() { return "(" + this.from + "..." + this.to + ")"; }
};
const r2 = new Range(1,3)
// using class keyword
class Range {
constructor(from, to) {
this.from = from;
this.to = to;
}
includes(x) { return this.from <= x && x <= this.to; }
*[Symbol.iterator]() {
for(let x = Math.ceil(this.from); x <= this.to; x++) yield x;
}
toString() { return `(${this.from}...${this.to})`; }
}