Скачать или смотреть Resolving the for...of Loop Issue in TypeScript on IE11

Learn how to solve the `for...of` loop issue in TypeScript when targeting IE11, with practical examples and alternative solutions.
---
This video is based on the question https://stackoverflow.com/q/62566305/ asked by the user 'user266909' ( https://stackoverflow.com/u/266909/ ) and on the answer https://stackoverflow.com/a/62566361/ provided by the user 'itsanewabstract' ( https://stackoverflow.com/u/13784318/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Typescript for (let i of someArray) doesn't work in IE11

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving the for...of Loop Issue in TypeScript on IE11

Developers often face challenges when ensuring cross-browser compatibility, especially when dealing with ES6 features in older browsers like Internet Explorer 11. One common dilemma arises when you try to use a for...of loop in TypeScript, only to find that it doesn't work in IE11.

The Problem: for...of Loop in IE11

When targeting ES6 in TypeScript, you might have written a loop similar to this:

[[See Video to Reveal this Text or Code Snippet]]

This syntax works beautifully in modern browsers like Edge and Chrome. However, when you try to run it in IE11, you get an error message indicating that a ; is missing at the start of the line. This can be frustrating, especially when you need your code to run smoothly across all browsers.

Why is This Happening?

The issue stems from Internet Explorer's limited support for ES6 features. Specifically, the for...of loop is not supported in IE11, leading to compatibility issues that leave developers scratching their heads.

The Solution: Adjusting Your Approach

So, how can you achieve the desired iteration over an array while maintaining compatibility with IE11? Here are two solutions:

Solution 1: Change the TypeScript Compiler Target

To ensure that your code can run in IE11, you can adjust the TypeScript compiler's target version.

Open your tsconfig.json file.

Look for the compilerOptions section.

Change the target value from ES6 to ES5 or earlier.

Here’s an example of what that might look like:

[[See Video to Reveal this Text or Code Snippet]]

This adjustment tells TypeScript to compile your code into a version that IE11 can understand.

Solution 2: Use a Traditional for Loop

If you're looking for a quick workaround, consider switching to the traditional for loop. Here’s how you could rewrite the loop:

[[See Video to Reveal this Text or Code Snippet]]

This older syntax is fully compatible with all browsers, including IE11.

Conclusion

In summary, the error you're encountering while using the for...of loop in TypeScript for IE11 is primarily due to the browser's lack of support for ES6 syntax. By either adjusting the TypeScript compiler target to ES5 or using a classic for loop, you can ensure that your code runs smoothly across all browsers.

Key Takeaways

IE11 does not support ES6 features, including the for...of loop.

Adjust your TypeScript target to ES5 for compatibility.

Alternatively, replace with a traditional for loop for quick fixes.

By understanding these limitations, you can write more robust code that performs consistently across different environments.