JSFiddle - React, Tailwind, and code Playground

JavaScript

let array1 = ["aaa","bbb"];
    let array2 = ["f1","f2","f3"];

    let temp =[];
    for(let i=0;i<array1.length;i++) {
      for(let j=0;j<array2.length;j++) {
        temp.push(`${array1[i]} ${array2[j]}`);
        
      }
    }

    console.log(temp);
    
const tempNew = [];

array1.forEach(item1 => {
    array2.forEach(item2 => {
        tempNew.push(item1 + " " + item2)
    })
 })
 
 console.log(tempNew);