JavaScript | Pragmateek

Introduction

Younger I was a dogmatic developer blindly enforcing the IT gurus’ dogma, later I’ve become more pragmatic preferring code readability and maintainability.
In JavaScript, it means omitting the semicolons to lighten the code and remove useless ceremony.

But in some rare corner cases omitting a semicolon can completely change the way the compiler interprets the code.
Hopefully, it will cause a compilation error, and in the worst case a hidden bug hard to track.

In this article, I describe one of these corner cases.

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Introduction

Recently, after months without using .Net/C#, I was enhancing an existing .Net/C# WPF application leveraging the .Net Task Parallel Library (TPL).

But naively applying the JavaScript Promises patterns I had used in the previous months I was bitten by a strange issue which forced me to use the quite exotic Unwrap extension method.

This article describes the issue, explains its cause, provides a fix with Unwrap, and finally provides a more modern version with the C# 5.0 async/await paradigm.

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Pragmateek

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Category Archives: JavaScript

When semicolons matter

Introduction

A basic use-case for Task Unwrap

Introduction