var a = [1,2,3,5,7,8];
var b = [1,2,4,5,6,8];
console.log(Array.from(new Set(a.concat(b))).sort())
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var a = [1,2,3,5,7,8];
var b = [1,2,4,5,6,8];
console.log(Array.from(new Set(a.concat(b))).sort())