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36.1 promises examples.html
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36.1 promises examples.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<script>
//using setTimeout with promies
function getData(status) {
return new Promise((resolve, reject) => {
console.log("getting data! please wait...");
setTimeout(() => {
if (status) {
resolve("Data fetched 100%");
} else {
reject("failed to get data");
}
}, 3000);
});
}
let onResolve = (result) => console.log(result);
let onReject = (error) => console.log(error);
//getData(true).then(onResolve);
//getData(true).catch(onReject);
//here we are going to use method chaning
getData(true).then(onResolve).catch(onReject); // also try with getData(false)....
//example two writing fucntion inside .then and .catch
function getData1(status) {
return new Promise((resolve, reject) => {
console.log("getting data2! please wait...");
setTimeout(() => {
if (status) {
resolve("Data fetched-2 100%");
} else {
reject("failed to get data-2");
}
}, 4000);
});
}
//also try with false value
getData1(true)
.then((result) => {
console.log(result);
})
.catch((error) => console.log("error:", error));
//division example
function division(a, b) {
return new Promise((resolve, reject) => {
var c = a / b;
setTimeout(() => {
if (c) {
resolve("your answer " + c);
} else {
reject("Failed to calculate");
}
}, 5000);
});
}
division(10, 2)
.then((result) => console.log(result))
.catch((error) => console.log("error:", error));
</script>
</body>
</html>