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1. Useful functions for chess

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   const getChessPosition = (v = [0,0]) => {

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     const o = {'a':0,'b':1,'c':2,'d':3,'e':4,'f':5,'g':6,'h':7}

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     return [Number(o[v[0]]), (Number(v[1]) - 1)]

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   }

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2. Example of working with arrays

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   const Promise = require('bluebird')

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   const items = {

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       employers: [

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           {