How to convert a iterator (FormData) to an object

Question

Given a form element new FormData(form) returns us an iterator.

// [["key1", "val1"],["key2", "val2"]]
console.log([new FormData(form)...])

I would now like to convert this to an object of the form:

{ "key1": "val1", "key2": "val2" }

Using ES6/7 features (supported by babel).

Any ideas if this is possible to do in a functional approach?

Answer 1

You can use for..of loop

var formData = new FormData();
formData.append("a", 123);
formData.append("b", 456);
var obj = {};
for(let prop of formData) {obj[prop[0]] = prop[1]};
console.log(obj)

---

Alternatively, using rest element, FormData() which returns an Iterator, Array.prototype.forEach().

var formData = new FormData();
formData.append("a", 123)
formData.append("b", 456)
var res = (d, it = [...d], r = {}, t =!(it.forEach(([k, v]) => {r[k] = v}))) => r;
console.log(res(formData))

Answer 2

You can simply define an object and loop through the iterator to get the values from it and assign it to the object you created.

var fd = new FormData(someForm);
po = {};
for (var key of fd){
  po[key] = fd[key];
}

Answer 3

using fuctional way

function getFormObj(form) {

 return  [...new FormData(form)].reduce((prev, [key,val]) => {
    return Object.assign(prev, {[key] : val}) ; 
  }, {}) ; 
}

Answer 4

It's an old question, but in recent times I think it can be solved using the following (just in case someone finds it useful):

let fd = new FormData(form)...
console.log(Array.from(fd.entries()))