Generate a string based on boolean object props

Question

I have an object like

{
  cash: true, 
  credit: false, 
  debit: true
}

need to generate a string in this case "Cash, Debit"

Answer 1

What you can do is, using Object.keys you can do a filter():

var Obj = {
  cash: true, 
  credit: false, 
  debit: true
};

console.log(
  Object.keys(Obj)
    .filter(function (key) {
      return Obj[key];
    })
);

If you want to add some formatting like make it completely string with the first letter capitalised, you can use map() and join() function:

var Obj = {
  cash: true, 
  credit: false, 
  debit: true
};

console.log(
  Object.keys(Obj)
    .filter(function (key) {
      return Obj[key];
    })
    .map(function (string) {
      return string.charAt(0).toUpperCase() + string.slice(1);
    })
    .join(", ")
);

Answer 2

You could use Object.entries, filter out the false, then map to the first element in each entry (uppercasing the first letter), and join the result

const result = Object.entries({cash: true, credit: false, debit: true})
                     .filter(([_,v]) => v)
                     .map((v) => v[0].charAt(0).toUpperCase() + v[0].slice(1))
                     .join(', ')

console.log(result);

Answer 3

Seems you want the list of keys with value equals to true.

E.g

let obj = {
  cash: true, 
  credit: false, 
  debit: true
}

let arr = [];

for(let prop in obj) {
  if(obj(prop) == true) arr.push(prop)
}

console.log(arr) //cash,debit

Answer 4

This is just another variation of the other answers, with included string manipulation for proper grammatical display, tho more verbose than pushing in an array and using .join(', '). It is probably not the solution I would employ in the real world, but hopefully does illustrate possibly ways to sort and handle data.

let obj = {
  cash: true, 
  credit: false, 
  debit: true
},

let finalString = '';
const keys = Object.keys(obj);
keys.forEach((key, index) => {
    if (obj[key]) {
      const keyString = `${key.capitalize()}';
      const comma = index !== keys.length -1 ? ', ' : '';
      finalString += (keyString + comma);
    }
})

Answer 5

use this function :

function make_string(x){
   var string = ""
   Object.keys(x).filter(function (key) {
      string += x[key] ? `${key},` : '';
   })
   return string.slice(0, -1)
}

for example :

var payments = {
  cash: true, 
  credit: false, 
  debit: true
}
console.log(make_string(payments))

---

--------------- the code snippet is here --------------

var payment = {
  cash: true, 
  credit: false, 
  debit: true
}
document.getElementById("abc").innerHTML = make_string(payment)


//---- the function to make string from object ----//
function make_string(x){
    var string = ""
    Object.keys(x).filter(function (key) {
        string += x[key] ? `${key},` : '';
    })
    return string.slice(0, -1)
}

<div id="abc"></div>