.some with e.target.dataset.id returns false but hardcoded value returns true-CodePudding

pokemonContainer.addEventListener('click', function (e) {
  let favourite = getStorageItem('pokemon');
  let eTargetID = e.target.dataset.id;
  let found = favourite.some((el) => el.id === eTargetID);
  console.log(found);
  console.log(eTargetID);
  if (!found) {
    favourite.push(pokemonArray[e.target.dataset.id - 1]);
    setStorageItem('pokemon', favourite);
  }
});

I'm trying to look for an id inside an array with objects. The object have an id of 1. My e.target.dataset.id is 1 but it returns false. But when I hardcode the value el.id === 1, it returns true. Am I doing something wrong? Why is it false even though e.target.dataset.id is also 1?

CodePudding user response：

Use el.id == eTargetId instead of el.id === eTargetId. (Use just two equal signs, not three.)

e.target.dataset.id is a JavaScript number 1. (It's a thing you can do math on, just like 3.141)
But your HTML element ID is a JavaScript string "1". (It's made out of letters, like "I have 1 apple.").

In JavaScript, there's a fuzzy equality operator ==, where numbers will be read as if they were strings when compared to strings. So, 1=="1" is true.
There is also a strict equality operator, where strings and numbers are considered completely different things. So, 1==="1" is false.