what is the best way to extract variables with '=' from a string in javascript

Question

I want to extract the variables names from a string like this: \"foo=valor bar=second\", and so on.

To return:

{ 
   foo: \"valor\", 
   ba         


        

Answer 1

var str = "foo=valor,bar=second";

var obj = {};

str.split(",").forEach(
     function(item){
     if(item){ 
        var vars = item.split("="); 
        obj[vars[0]] = vars[1] 
      }
 });
 console.log(obj)

Answer 2

You can use Regex Look Aheads to check for a variable name that is preceded by an = symbol

var str = "foo=valor bar=second";
var varRegex = /\w+(?=(\s)*(\=))/g;
var valueRegex = /(?<=(\=)[\s'"]*)\w+/g;

var varArr = str.match(varRegex);
var valueArr = str.match(valueRegex);
console.log(valueArr);

let obj = {};
for(let i in varArr) {
  obj[varArr[i]] = valueArr[i];
}

console.log(obj);

Answer 3

Not necessarily the quickest answer (in terms of speed of submission), but less regular expressions to maintain and less variables to store.

function toJSON(str) {
  const regex = /(\w+)\=(\w+)\s*/g;
  let result = {};
  let match;

  while (match = regex.exec(str)) {
    result[match[1]] = match[2];
  }

  return result;
}

console.log(toJSON("foo=valor bar=second"));

Answer 4

Different approach from the previous answer: You can split the string on spaces and then map the result array, splitting on the equal sign to create your object (left side is property, right side is value)

If you need it your specific format you can reduce it to convert the array into one big object with all the values

let a = "foo=valor bar=second"

console.log(a.split(' ').map((i,v) => { return JSON.parse(`{"${i.split('=')[0]}": "${i.split('=')[1]}"}`);}))


let b = a.split(' ').map((i,v) => { return JSON.parse(`{"${i.split('=')[0]}": "${i.split('=')[1]}"}`);})


console.log(b.reduce(function(acc, x) {
    for (var key in x) acc[key] = x[key];
    return acc;
   }));