I have this object

a = {key:'animals',
     options: ['dog','cat','penguin']}

How can I simplify it to this:

b = ['animals','dogcatpenguin']

I have this object

a = {key:'animals',
     options: ['dog','cat','penguin']}

How can I simplify it to this:

b = ['animals','dogcatpenguin']

• javascript
• arrays
• object

• does your keys are consistent ? – Kailash Yadav Commented Apr 29, 2015 at 15:13
• Iterate over the properties and push their values to a new array. Note however that browser may iterate over properties in different orders. If you always have these properties you can just access them directly. What have you tried so far? Where are you stuck? – Felix Kling Commented Apr 29, 2015 at 15:13
• 2 You can try var b = []; b.push(a.key); b.push(a.options.join('')); – Kailash Yadav Commented Apr 29, 2015 at 15:14
• 1 var b = new Array(a.key, a.options.join("")); - It's important to note what @FelixKling says if you intend to iterate, then order of an object's keys is never guaranteed – CodingIntrigue Commented Apr 29, 2015 at 15:22
• I am using this solution for an Angular project and first answer works perfectly. Thank you all:) – Son Le Commented Apr 30, 2015 at 7:28

6 Answers 6

Like so

var a = {
  key: 'animals',
  options: ['dog','cat','penguin']
};

var key, b = [];

for (key in a) {
  b.push(Array.isArray(a[key]) ? a[key].join('') : a[key]);
}

console.log(b);

Or you can use Object.keys with .map

var a = {
    key: 'animals',
    options: ['dog','cat','penguin']
};

var b = Object.keys(a).map(function (key) {
    return Array.isArray(a[key]) ? a[key].join('') : a[key];     
});

console.log(b);

Try this

var a = {
  key: 'animals',
  options: ['dog', 'cat', 'penguin']
}
var result = Object.keys(a).map(function(key){
  var item = a[key];
  return item instanceof Array ? item.join('') : item;
});
console.log(result);

You can just create a new array with your puted values

var a = {key:'animals',
     options: ['dog','cat','penguin']};

var b = [
  a.key,
  a.options.join('')
];

document.write(JSON.stringify(b));

var a = {
  key: 'animals',
  options: ['dog','cat','penguin']
};

var idx, b = [];

for (idx in a) { //Iterate through all the items of object a
  b.push(Array.isArray(a[key]) ? a[key].join('') : a[key]); //Check if item is array join with (blank) or if not directly push it new array
}

console.log(b);

Another possible solution.

a = {key:'animals',options: ['dog','cat','penguin']}

var b = new Array();
for(var index in a) { 
    var attr = a[index].toString().split(",").join("");
    b.push(attr);
}

b = [a.key,Object.values(a)[1].reduce((a,b)=> a+b)]