Fairly new to JSON and I'm trying to get my head around conversions. I have an array:

['Role1', 'Role2', 'Role3']

and I'm trying to stringify it so that it reads as

{"Role1": true, "Role2": true, "Role3": true}

So far I've tried assigning the original array to an object and the calling stringify but I can't figure out how to add the boolean value in the string. Thanks in advance.

CodePudding user response：

You'll have to create an intermediate reduce function to assign those values before converting to JSON.

const data = ['Role1', 'Role2', 'Role3']

const makeJson = () =>
  JSON.stringify(data.reduce((a, c) => ({ ...a, [c]: true }), {}))

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

CodePudding user response：

Is this what you need as output?

const arr = ['Role1', 'Role2', 'Role3']

const result = JSON.stringify(arr.reduce((a, n)=>{
    return {
        ...a,
        [n]: new Boolean(true).toString()    
    }
},{}))
console.log(result)

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CodePudding user response：

Another approach could be to combine Object.fromEntries with Array.prototype.map

const data = ['Role1', 'Role2', 'Role3']

const result = Object.fromEntries(data.map(s => [s, true]));

console.log(JSON.stringify(result));

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CodePudding user response：

This should do the trick:

let rolesArray = ['Role1', 'Role2', 'Role3']; 
let rolesObject = {};

// iterate over roles to fill an object 
rolesArray.forEach((role) => {
    rolesObject[role] = true; 
});

JSON.stringify(rolesObject) // Outputs the desired string

Or in a more concise way but less readable for a SO example :

JSON.stringify(rolesArray.reduce((o, s) => { o[s] = true; return o }, {}));

CodePudding user response：

I have a preference for using the for-loop — still valid but other methods will be much short.

var array = ["Role1", "Role2", "Role3"],
  json = {};
for (i = 0; i < array.length; i  ) {
  json[array[i]] = true;
}
console.log(json);

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CodePudding user response：

Use reduce() so we can set the value to true without a second loop

Using the spread operator (...) to merge the objects

const data = ['Role1', 'Role2', 'Role3'];
const obj = data.reduce((prev, cur) => ({ ...prev, [cur]: true }), {});

console.log(obj);
console.log(JSON.stringify(obj));

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{
  "Role1": true,
  "Role2": true,
  "Role3": true
}
{"Role1":true,"Role2":true,"Role3":true}

CodePudding user response：

if you want to do that you must this code Below .

json-encode(Array)