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let effects = 0;
const iterable = {
[Symbol.iterator]() {
return {
next() {
effects++;
return { done: true };
}
};
}
};
new Map(iterable);
new Set(iterable);
new WeakMap(iterable);
new WeakSet(iterable);
Array.from(iterable);
BigInt64Array.from(iterable);
BigUint64Array.from(iterable);
Float32Array.from(iterable);
Float64Array.from(iterable);
Int16Array.from(iterable);
Int32Array.from(iterable);
Int8Array.from(iterable);
Uint16Array.from(iterable);
Uint32Array.from(iterable);
Uint8Array.from(iterable);
Uint8ClampedArray.from(iterable);
Object.fromEntries(iterable);
assert.equal(effects, 17);
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