Convert JavaScript ES6 function into ES3

Question

I have an array that I successfully transform into a string format with an EcmaScript-6 function. However, how can I do this using EcmaScript-3? The receiving endpoint requires an ES3 function.

Original array:

formdata: [
    1: {name: "gender", value: "F", focus: 0, type: "radio"}
    2: {name: "firstname", value: "empty", focus: 0, type: "text"}
    3: {name: "lastname", value: "empty", focus: 0, type: "text"}
    4: {name: "birthday", value: "empty", focus: 0, type: "text"}
    5: {name: "street", value: "empty", focus: 0, type: "text"}
    6: {name: "streetNo", value: "empty", focus: 0, type: "text"}
]

Required string format

let formdata = gender.radio|F|0;firstName.text|empty|1;lastName.text|empty|0;street.text|empty|0;houseNumber.text|empty|0;zip.text|empty|0;city.text|empty|0;country.select-one|de|0;birthdate-day.text|empty|0;birthdate-month.text|empty|0;birthdate-year.text|empty|0;email.email|empty|0;code.text|filled_out|0

My working solution with ES6:

let res = formdata.map(({name,value,focus,type}) => `${name}.${type}|${value}|${focus}`).join(';')

My take on converting to ES3:

var res = formdata.map(({name,value,focus,type}) { 
  ("name" + "." + "type" + "|" + "value" + "focus").join(;)
}

This solution is obviously not working and also I am not sure whether it is valid ES3 JavaScript.

Thanks!

Answer 1

Issues with your ES3 attempt:

• The arrow function is missing the arrow, but is also an ES6 addition to the syntax
• .join(;) is not valid JavaScript. .join(";") is.
• destructuring syntax was introduced in ES6
• .map was introduced in ES5
• You need one more "|"

So:

 var formdata = [{name: "gender", value: "F", focus: 0, type: "radio"},{name: "firstname", value: "empty", focus: 0, type: "text"},{name: "lastname", value: "empty", focus: 0, type: "text"}, {name: "birthday", value: "empty", focus: 0, type: "text"},{name: "street", value: "empty", focus: 0, type: "text"},{name: "streetNo", value: "empty", focus: 0, type: "text"},]; var arr = []; for (var i = 0; i < formdata.length; i++) { var elem = formdata[i]; arr.push(elem.name + "." + elem.type + "|" + elem.value + "|" + elem.focus); } var str = arr.join(";"); console.log(str);