Abra o console!

      function callbackForEach(element, i, array) { 
        return arrayVazio.push(array[i] = element * 2); 
      } 

      function forEach(array, callback) { 
        for (let i = 0; i < array.length; i++) { 
            callback(array[i], i, array) 
        } 
      } 
      forEach(arrayForEach, callbackForEach) 
    

      function callbackFind(element, i, array) {
        return element > 2 && element < 12

      }

      function callbackFindTwo(element, i, array) {
        return element > 15
        
      }

      function find(array, callback) {
        for (let i = 0; i < array.length; i++) {
          if (callback(array[i]) === true) {
            return array[i]
          }
        }
        return undefined
      }
      find(arrayFind, callbackFind)
      find(arrayFind, callbackFindTwo)
    

      function indexOf(array, elementoPesquisa) {
  
        for(let i = 0; i < array.length; i++) {
          if(array[i] === elementoPesquisa) {
            return i
          }
        }
        return -1
      }
      indexOf(arrayIndexOf, 2)
      indexOf(arrayIndexOf, "apollo")
    

      function includes(array, element) {
        for (let i = 0; i < array.length; i++) {
          if(element > 500) {
            return true
          }else if(element === "duck") {
            return true
          }
        }
        return false
      }
      includes(arrayIncludes, 10)
      includes(arrayIncludes, "duck")
    

      const callbackSome = (element, i, array) => {
        return element > 82 && true;
      };
      
      const callbackSome2 = (element, i, array) => {
        if (element) {
          return false;
        }
      };
      
      function some(array, callback) {
        for (let i = 0; i < array.length; i++) {
          if(callback(array[i])){
            return true
          }
        }
        return false
      }
      some(arrySome, callbackSome)
      some(arrySome, callbackSome2)
    

      function join(array, value=",") {
        let res = ""
        for (let i = 0; i < array.length; i++) {
          if(array[i] === null || array[i] === undefined) {
            array[i] = ""
          }
          if(i !== 0) {
            res += value + array[i]
          }else {
            res += array[i] 
          } 
        }
        return res
      }
      join(arrayJoin, " ")
      join(arrayJoin, "")
      join(arrayJoin, "-")