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Roland Weigelt - A Stupid Little TypeScript Mistake (Part 2)

 2 years ago
source link: https://weblogs.asp.net/rweigelt/a-stupid-little-typescript-mistake-part-2?WT_mc_id=DOP-MVP-4025064
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A Stupid Little TypeScript Mistake (Part 2)

Thursday, August 19, 2021

After my blog post in June, here is another tale from a C# developer getting his feet wet with TypeScript.

TypeScript’s type checking makes my life so much easier, but it does not catch everything. Recently I forgot an important part of a for-loop. Here is a stripped-down example:

var items=["item0", "item1", "item2"];
for (var n=0;items.length;n++)
{
    // ...
}

The code compiles, but runs into an endless loop – the “n<” is missing in the condition.

If I write similar code in C#…

var items=new[] {"item0", "item1", "item2"};
for (var n=0;items.Length;n++)
{
    // ...
}

… the compiler tells me what I did wrong:

Cannot implicitly convert type 'int' to 'bool'

Ok, another (TypeScript) lesson learned.

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