javascript - Typechecking in vanilla JS – why use typeof for string but typeof .matches for booleans?

Question

I'm checking some variables from localStorage before continuing my script. First this:

const hasStorageValue = typeof storageValue === 'string'

Then I read an example of something similar for booleans. Like this:

const hasStorageValue = typeof storageValue.matches === 'boolean'

Curious if the two uses are equivalent or if there's another requirement for booleans than for strings?

Edit: Found back to the original code I was looking at. It's like this:

const mql = window.matchMedia('(prefers-color-scheme: dark)');
  const hasMediaQueryPreference = typeof mql.matches === 'boolean';

From "A first pass" in this article.

window.matchMedia() returns an object, as Nicolas correctly points to in the comments:

I mixed element.matches() with window.matchMedia().matches – which was the reason for asking here.

question from:https://stackoverflow.com/questions/65895288/typechecking-in-vanilla-js-why-use-typeof-for-string-but-typeof-matches-for-b

Answer 1

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