What is difference between async and await?

await can only be used in async functions . It is used for calling an async function and waits for it to resolve or reject. await blocks the execution of the code within the async function in which it is located.

An async function runs synchronously until the first await keyword . This means that within an async function body, all synchronous code before the first await keyword executes immediately.

await can be used on its own with JavaScript modules. Note: The purpose of async / await is to simplify the syntax necessary to consume promise-based APIs . The behavior of async / await is similar to combining generators and promises. Async functions always return a promise.

async keyword tells dart that this function might use asynchronous logic . So void main has the async keyword. await keyword tells dart that the following statement will return a Future . The Future should be completed and then the code below will be executed.