JSFiddle - React, Tailwind, and code Playground

JavaScript

var array1 = ["a","b","c"];
var array2 = ["e", "f","g"];

function zip(source1, source2){
    var result=[];
    source1.forEach(function(o,i){
    result.push(o);
    result.push(source2[i]);
    });
    return result
}

console.log(zip(array1, array2));