59 lines
2.0 KiB
JavaScript
59 lines
2.0 KiB
JavaScript
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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 iteratorClose = require('../internals/iterator-close');
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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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module.exports = function (iterable, unboundFunction, options) {
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var that = options && options.that;
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var AS_ENTRIES = !!(options && options.AS_ENTRIES);
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var IS_ITERATOR = !!(options && options.IS_ITERATOR);
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var INTERRUPTED = !!(options && options.INTERRUPTED);
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var fn = bind(unboundFunction, that, 1 + AS_ENTRIES + INTERRUPTED);
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var iterator, iterFn, index, length, result, next, step;
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var stop = function (condition) {
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if (iterator) iteratorClose(iterator);
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return new Result(true, condition);
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};
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var callFn = function (value) {
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if (AS_ENTRIES) {
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anObject(value);
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return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);
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} return INTERRUPTED ? fn(value, stop) : fn(value);
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};
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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 = callFn(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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try {
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result = callFn(step.value);
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} catch (error) {
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iteratorClose(iterator);
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throw error;
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}
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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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