I have an array of objects, each object has a title, content and contentHTML. I want to map over this array and create a new object. The new object will take the value of the title property and use this as the parent property for each of the content and contentHTML properties. The code below only seems to be getting the last object in the array.
The results is:
{
"sidebar": {
"text": "Some sidbar text here",
"content": "<p>Some sidebar text here</p>"
}
}
The expected result is:
{
header: {
text: "Some header text here",
content: "<p>Some header text here</p>"
},
footer: {
text: "Some footer text here",
content: "<p>Some footer text here</p>"
},
sidebar: {
text: "Some sidbar text here",
content: "<p>Some sidebar text here</p>"
}
}
var originalObj = [{
title: "header",
content: "Some header text here",
contentHTML: "<p>Some header text here</p>"
},
{
title: "footer",
content: "Some footer text here",
contentHTML: "<p>Some footer text here</p>"
},
{
title: "sidebar",
content: "Some sidbar text here",
contentHTML: "<p>Some sidebar text here</p>"
}
];
let newObject = {};
for (let item of originalObj) {
var tempObj = {
[item.title]: {
text: item.content,
content: item.contentHTML
}
};
newObject = tempObj;
}
console.log(newObject);I have an array of objects, each object has a title, content and contentHTML. I want to map over this array and create a new object. The new object will take the value of the title property and use this as the parent property for each of the content and contentHTML properties. The code below only seems to be getting the last object in the array.
The results is:
{
"sidebar": {
"text": "Some sidbar text here",
"content": "<p>Some sidebar text here</p>"
}
}
The expected result is:
{
header: {
text: "Some header text here",
content: "<p>Some header text here</p>"
},
footer: {
text: "Some footer text here",
content: "<p>Some footer text here</p>"
},
sidebar: {
text: "Some sidbar text here",
content: "<p>Some sidebar text here</p>"
}
}
var originalObj = [{
title: "header",
content: "Some header text here",
contentHTML: "<p>Some header text here</p>"
},
{
title: "footer",
content: "Some footer text here",
contentHTML: "<p>Some footer text here</p>"
},
{
title: "sidebar",
content: "Some sidbar text here",
contentHTML: "<p>Some sidebar text here</p>"
}
];
let newObject = {};
for (let item of originalObj) {
var tempObj = {
[item.title]: {
text: item.content,
content: item.contentHTML
}
};
newObject = tempObj;
}
console.log(newObject);6 Answers
Reset to default 3You are overwriting your object with new value every time you're doing
var tempObj = {//object keys}
Use spread operator to copy the previous values. Spread operator loops through objects iterable values and expands them.
var originalObj = [
{
title: "header",
content: "Some header text here",
contentHTML: "<p>Some header text here</p>"
},
{
title: "footer",
content: "Some footer text here",
contentHTML: "<p>Some footer text here</p>"
},
{
title: "sidebar",
content: "Some sidbar text here",
contentHTML: "<p>Some sidebar text here</p>"
}
];
let newObject = {};
for (let item of originalObj) {
newObject = {
...newObject,
[item.title]: {
text: item.content,
content: item.contentHTML
}
};
}
console.log(newObject);You were overriding newObject with the contents of tempObj it's much easier if you just write directly into newObject like this.
var originalObj = [{
title: "header",
content: "Some header text here",
contentHTML: "<p>Some header text here</p>"
},
{
title: "footer",
content: "Some footer text here",
contentHTML: "<p>Some footer text here</p>"
},
{
title: "sidebar",
content: "Some sidbar text here",
contentHTML: "<p>Some sidebar text here</p>"
}
];
let newObject = {};
for (let item of originalObj) {
newObject[item.title] = {
text: item.content,
content: item.contentHTML
}
}
console.log(newObject);I hope this makes sense
You can also use Array#reduce to do something like this perhaps:
var originalObj = [
{
title: "header",
content: "Some header text here",
contentHTML: "<p>Some header text here</p>"
},
{
title: "footer",
content: "Some footer text here",
contentHTML: "<p>Some footer text here</p>"
},
{
title: "sidebar",
content: "Some sidbar text here",
contentHTML: "<p>Some sidebar text here</p>"
}
];
var output = originalObj.reduce((accumulator, ele) => {
accumulator[ele['title']] = {'text': ele['content'], 'content': ele['contentHTML']}
return accumulator;
}, {})
console.log(output);This alternative uses the function reduce to build the desired output.
var originalObj = [ { title: "header", content: "Some header text here", contentHTML: "<p>Some header text here</p>" }, { title: "footer", content: "Some footer text here", contentHTML: "<p>Some footer text here</p>" }, { title: "sidebar", content: "Some sidbar text here", contentHTML: "<p>Some sidebar text here</p>" }],
newObject = originalObj.reduce((a, {title, content: text, contentHTML: content} = obj) => {
return Object.assign(a, {[title]: {text, content}});
}, Object.create(null));
console.log(newObject);.as-console-wrapper { max-height: 100% !important; top: 0; }It has been answered but if it still helps:
var newObject = {};
for (let item of originalObj) {
newObject[item.title] = {
text: item.content,
content: item.contentHTML
}
};
I tried with a different example and wanted to answer more dynamically
firstly, getting how many unique values we can have for a property i.e,res array in this example
then, filtering the objects and pushing into an array that the object's property matches with each unique value of the res array
in the example the resultant object is resObj
let anArray = [{id: 1, name:"orange"},
{id: 2, name:"orange"},
{id: 3, name:"apple"},
{id: 4, name:"apple"},
{id: 5, name:"rusk"},
{id: 6, name:"grape"}]
let res = [...new Set(anArray.map(item => item.name))];
let resObj = {};
let newObj = (item, arr) => {
let resArr = [];
anArray.map((obj) => {
if(item == obj.name){
resArr.push(obj)
}
})
return resArr
}
resObject = Object.fromEntries(res.map((item) => [item, newObj(item, anArray) ]) )
console.log(resObject)