js-series/15-Timing-&-Interval-Functions.html at main · jdcodebase/js-series · GitHub

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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
```html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>15-Timing-&-Interval-Functions</title>
  </head>
  <body>
    <script>
      /* ===============================
         setTimeout() – BASIC EXAMPLE
         Runs code once after a delay
         =============================== */

      setTimeout(() => {
        console.log("Hello after 2 seconds");
      }, 2000); // runs after 2 seconds

      /* ===============================
         setTimeout() with clearTimeout()
         Canceling a timeout
         =============================== */

      const timeout = setTimeout(() => {
        console.log("This will not run");
      }, 3000);

      console.log(timeout); // timeout ID
      clearTimeout(timeout); // cancels the timeout

      /* ===============================
         Another clearTimeout example
         =============================== */

      const timeout2 = setTimeout(() => {
        console.log("This will not run");
      }, 3000);

      console.log(timeout2); // timeout ID
      clearTimeout(timeout2); // timeout cancelled

      /* ===============================
         setInterval() – BASIC EXAMPLE
         Runs code repeatedly
         =============================== */

      const intervalID = setInterval(() => {
        console.log("Running every second");
      }, 1000);

      console.log(intervalID); // interval ID
      clearInterval(intervalID); // interval stopped immediately

      /* ===============================
         PRACTICAL EXAMPLE
         Countdown Timer
         =============================== */

      let count = 10;

      const timer = setInterval(() => {
        console.log(count);
        count--;

        // stop timer when count is finished
        if (count < 0) {
          clearInterval(timer);
          console.log("Time's up!");
        }
      }, 1000);

      /* ===============================
         PRACTICAL EXAMPLE
         Loading Animation
         =============================== */

      let dots = 0;

      const loader = setInterval(() => {
        dots++;
        console.log("Loading" + ".".repeat(dots));

        // reset dots after 3
        if (dots === 3) {
          dots = 0;
        }
      }, 500);
    </script>
  </body>
</html>
```