One thing I notice for the sake of readability is that I tend to create new variables for data that I already have on hand. I'm curious, does this impact performance significantly?
Here's an example of what I mean:
const isAdult = this.data.person.age >= 18;
const hasChildren = this.data.person.hasChildren;
if (isAdult && hasChildren) {}
As opposed to doing this:
if(this.data.person.age >= 18 && this.data.person.hasChildren) {}
When considering the impact on performance, it all comes down to one question: "What were the results of your testing?"
Undoubtedly, there will be a performance impact. However, in order for it to be noticeable or measurable, a significant number of variables must be declared.
In general, reducing the number of variables (as long as they are not repurposed) is recommended to enhance code readability. While creating more direct data references can sometimes be beneficial in Javascript to avoid lengthy scope chains, this may slightly deviate from the main topic at hand.
Simply put, the answer is no; there is no significant effect on performance.
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