From the course: ESLint: Checking for Syntax and Logic Errors

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Ensuring accurate values

Ensuring accurate values

From the course: ESLint: Checking for Syntax and Logic Errors

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Ensuring accurate values

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- [Instructor] The accurate values section of index.js starts on line 54, and it contains code without any syntax errors, but there are a couple indications in this code that I may have made typing errors and I can use ESLint rules to flag these for me. The scores array on line 54 includes an empty element. This is known as a sparse array and while it can sometimes be useful, it can also indicate my finger simply slipping on the keyboard and typing an extra comma. I can catch this with ESLint using the no sparse arrays rule which flags back to back commas in an array literal. This rule takes a simple string as its argument. Over in my eslintrc file, I'm going to add code to flag this issue as an error, so no-sparse-arrays, error, and then I'm going to save that, return to my code, and now I've got that red squiggle, and when I put my pointer over it, I've got that no-sparse-arrays rule flagged from ESLint. And if I go ahead…

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