JSFiddle - React, Tailwind, and code Playground

JavaScript

var arrays1 = [1,1,2];
var arrays2 = [3,4,6];
var arrays3 = [];
var i = 0;
for(i = 0; i < arrays1.length; i+=2){                                
    arrays3.push(arrays1[i]);
}
i = 0;
for(i = 0; i < arrays2.length; i+=2){                
    var tem = false;
    for(j = 0; j < arrays1.length; j++){
        if (arrays2[i] === arrays1[j]){
            tem = true;                        
        }                    
    }   
    if (tem === false){
        arrays3.push(arrays2[i]);
    }
}
console.log(arrays3);