21 lines
583 B
JavaScript
21 lines
583 B
JavaScript
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var ITERATOR = require('./$.wks')('iterator')
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, SAFE_CLOSING = false;
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try {
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var riter = [7][ITERATOR]();
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riter['return'] = function(){ SAFE_CLOSING = true; };
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Array.from(riter, function(){ throw 2; });
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} catch(e){ /* empty */ }
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module.exports = function(exec, skipClosing){
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if(!skipClosing && !SAFE_CLOSING)return false;
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var safe = false;
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try {
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var arr = [7]
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, iter = arr[ITERATOR]();
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iter.next = function(){ return {done: safe = true}; };
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arr[ITERATOR] = function(){ return iter; };
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exec(arr);
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} catch(e){ /* empty */ }
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return safe;
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};
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