44 lines
1.7 KiB
JavaScript
44 lines
1.7 KiB
JavaScript
var anObject = require('../internals/an-object');
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var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
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var toLength = require('../internals/to-length');
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var bind = require('../internals/function-bind-context');
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var getIteratorMethod = require('../internals/get-iterator-method');
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var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
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var Result = function (stopped, result) {
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this.stopped = stopped;
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this.result = result;
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};
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var iterate = module.exports = function (iterable, fn, that, AS_ENTRIES, IS_ITERATOR) {
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var boundFunction = bind(fn, that, AS_ENTRIES ? 2 : 1);
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var iterator, iterFn, index, length, result, next, step;
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if (IS_ITERATOR) {
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iterator = iterable;
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} else {
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iterFn = getIteratorMethod(iterable);
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if (typeof iterFn != 'function') throw TypeError('Target is not iterable');
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// optimisation for array iterators
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if (isArrayIteratorMethod(iterFn)) {
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for (index = 0, length = toLength(iterable.length); length > index; index++) {
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result = AS_ENTRIES
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? boundFunction(anObject(step = iterable[index])[0], step[1])
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: boundFunction(iterable[index]);
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if (result && result instanceof Result) return result;
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} return new Result(false);
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}
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iterator = iterFn.call(iterable);
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}
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next = iterator.next;
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while (!(step = next.call(iterator)).done) {
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result = callWithSafeIterationClosing(iterator, boundFunction, step.value, AS_ENTRIES);
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if (typeof result == 'object' && result && result instanceof Result) return result;
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} return new Result(false);
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};
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iterate.stop = function (result) {
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return new Result(true, result);
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};
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