forawaitof

The for await...of loop is a control flow statement in JavaScript that allows asynchronous iteration. It enables developers to iterate over asynchronous iterables, such as streams of data or results from asynchronous operations, in a sequential manner. This construct is particularly useful when dealing with promises that resolve over time.

The syntax of the for await...of loop is similar to the regular for...of loop. It consists of the keywords for, await, and of, followed by a variable declaration and an asynchronous iterable. Inside the loop, each iteration waits for the next value to be produced by the asynchronous iterable before proceeding.

One key characteristic of for await...of is that it inherently handles promises. If an asynchronous iterable yields a promise, the loop will automatically await its resolution before assigning the resolved value to the loop variable. This simplifies the process of working with asynchronous data sources, eliminating the need for manual promise chaining or complex async/await patterns within the loop body for each item.

The for await...of loop is part of the ECMAScript standard and is supported in modern JavaScript environments. It is commonly used in conjunction with async functions and provides a clean and readable way to consume asynchronous sequences of data.