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Editorial Team
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Asked: 2026-05-27T01:09:50+00:00

I have an array: this.entries = [] . I run some code and it

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I have an array: this.entries = []. I run some code and it runs through this if statement several times:

if(this.entries[2] != null)

Everything works fine until after all the code runs I reset the array:

I’ve tried doing this.entries = [] and this.entries.splice(0, this.entries.length);

I re-run the code and when it gets to the if statement I get this error:

Cannot read property '2' of null

As far as I can tell there is nothing different. Tips and help would be very appreciated.

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1 Answer

  1. Editorial Team

    There are several objects here. There is this which of course should never be null. Then there is this.entries Which is an array. Think of it as a container that can contain things. Then, there is this.entries[i] Which are the things in the container.

    when this.entries[2] fails, it means that there is no object in slot 2 of the container.

    However, the error Cannot read property '2' of null means that there IS NO CONTAINER. That is, the array itself has been set to null.

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