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What are async methods in JavaScript?
The async function declaration as the name suggests defines an asynchronous function. This function returns an AsyncFunction object.
Syntax
Here’s the syntax −
async function functionname([param[, param[, ... param]]]) {
statements to be executed
}Example
Let’ see an example, which prints the result after 5 seconds −
<html>
<body>
<script>
function displayFunction(num) {
return new Promise(resolve => {
setTimeout(() => {
resolve(num);
}, 5000);
});
}
async function add2(num) {
const x = displayFunction(7);
const y = displayFunction(5);
return num * await x * await y;
}
add2(15).then(result => {
document.write("Multiplication Result (after 5 seconds): "+result);
});
</script>
</body>
</html>
Updated on: 15-Jun-2020
99 Views
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