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並前往https://discuss.codecademy.com/t/when-should-i-use-findindex-vs-indexof/368185

When should I use .findIndex() vs .indexOf()? - JavaScript FAQ

indexOf('my')); //logs `2` to the console because the string value `'my'` is at the 2nd index (arrays in JS start at 0). We should use .findIndex() when we ...

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