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robhol/mystery.js Secret

Created October 23, 2015 21:31
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mystery.js
inp => inp.split('')
.map( (c, i) => [i > 0 ? lookup[inp.charAt(i-1)] : 0, lookup[c] ] )
.map( x => [ x[0] < x[1] ? x[0] : 0, x[1] ] )
.reduce( (pv, x) => pv + x[1] - 2 * x[0], 0);
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