Travis CI : A simple utility for all your conversion needs let NumParser = require('numparser') console.log(NumParser('10')) // 10 // before[10, 10, 10].map(parseInt) // [10, NaN, 2]// after[10, 10, 10].map(NumParser) // [10, 10, 10] (•_•) PROBLEM <) )╯ / \ ( •_•) SOLVED \( (> / \