Imagine a situation where you need to loop through a constant array. Is there a distinction between
[...arr].forEach((elem) => {
// your operations
});
and
arr.forEach((elem) => {
// your operations
});
Are these two methods interchangeable?
Making a duplicate of the array allows for safer manipulation within the callback function. For instance:
[...arr].forEach((val, i, a) => a.push(val))
If arr is not actually an array but something resembling one, spreading it into an array enables the use of forEach. For example:
[...document.getElementsByTagName('p')].forEach(p => console.log(p))
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