array-iterator-shrinking.js

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// If an array is truncated to the left of an iterator it, it.next() returns { done: true }.

load(libdir + "asserts.js");

load(libdir + "iteration.js");

var arr = [0, 1, 2];

var it = arr[Symbol.iterator]();

var ki = arr.keys();

var ei = arr.entries();

assertIteratorNext(it, 0);

assertIteratorNext(it, 1);

assertIteratorNext(ki, 0);

assertIteratorNext(ki, 1);

assertIteratorNext(ei, [0, 0]);

assertIteratorNext(ei, [1, 1]);

arr.length = 1;

assertIteratorDone(it, undefined);

assertIteratorDone(ki, undefined);

assertIteratorDone(ei, undefined);