Can you spot any variance between these two instances:
const elements = document.querySelectorAll('.someclass');
for(const element of elements){
// perform an action
}
versus
for(const element of document.querySelectorAll('.someclass')){
// perform an action
}
Is the function re-invoked on each iteration? Or is the distinction solely in the syntax?
They are practically identical, with the exception of the additional nodes variable name. Upon encountering
for (const varName of <expression>)
the interpreter will assess expression first before attempting to iterate over it. This evaluation only occurs once, as the goal is to obtain an iterable result.
const getIterable = function* () {
console.log('getIterable running');
yield 'foo';
yield 'bar';
yield 'baz';
};
for (const item of getIterable()) {
console.log(item);
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