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							22 lines
						
					
					
						
							413 B
						
					
					
				
			
		
		
	
	
							22 lines
						
					
					
						
							413 B
						
					
					
				'use strict'; | 
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module.exports = (iterable, reducer, initVal) => new Promise((resolve, reject) => { | 
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	const iterator = iterable[Symbol.iterator](); | 
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	let i = 0; | 
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 | 
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	const next = total => { | 
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		const el = iterator.next(); | 
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 | 
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		if (el.done) { | 
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			resolve(total); | 
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			return; | 
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		} | 
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 | 
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		Promise.all([total, el.value]) | 
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			.then(value => { | 
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				next(reducer(value[0], value[1], i++)); | 
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			}) | 
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			.catch(reject); | 
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	}; | 
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 | 
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	next(initVal); | 
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});
 | 
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