{
Type: "Fire",
Name: "Shark",
StartRange0: "10",
EndRange0: "20",
StartRange1: "30",
EndRange1: "40",
StartRange2: "60",
EndRange2: "70"
}
In the above object, StartRange and EndRange can be more items in different objects. i.e those values are obtained from a loop( StartRange + index), so there maybe StartRange1,2,3... lly, EndRange1,2,3...
The above object structure must be changed to,
{
"Fire":{
"Name":"Shark",
"List":[
[
"10",
"20"
],
[
"30",
"40"
],
[
"60",
"70"
]
]
}
}
The List array inside the object is combination of [StartRange0,EndRange0],[StartRange1,EndRange2]... So on...
I tried,
let newObj = {}
newObj[oldObj.Type] = {
Name: oldObj.Name, //oldObj is the first object defined above.
List: [[oldObj.StartRange0,oldObj.EndRange0],[oldObj.tartRange1,oldObj.EndRange1],[oldObj.StartRange2,oldObj.EndRange2]]
}
But here, it is limited to StartRange2 and EndRange2 but I need it for StartRangeN and EndRangeN.
This is how I would have done map it
const input = {
Type: "Fire",
Name: "Shark",
StartRange0: "10",
EndRange0: "20",
StartRange1: "30",
EndRange1: "40",
StartRange2: "60",
EndRange2: "70"
}
const toList = (l) => Array.from({
length: Object.keys(l).length / 2
}, (_, N) => [l[`StartRange${N}`], l[`EndRange${N}`]])
const toOutput = ({ Type, Name, ...rest }) => {
const List = toList(rest)
return ({
[Type]: {
Name,
List
}
})
}
const output = toOutput(input)
console.log(output)You can play around with this example
const object = {
Type: "Fire",
Name: "Shark",
StartRange0: "10",
EndRange0: "20",
StartRange1: "30",
EndRange1: "40",
StartRange2: "60",
EndRange2: "70"
};
let index = 0;
let isFinished = false;
const results = [];
while (!isFinished) {
const startKey = `StartRange${index}`;
const endKey = `EndRange${index}`;
isFinished = !object.hasOwnProperty(startKey) || !object.hasOwnProperty(endKey);
!isFinished && results.push([object[startKey], object[endKey]]);
index++;
}
console.log(results);
This may work but it would be better if you could change that structure and use another one.
const test = {
Type: "Fire",
Name: "Shark",
StartRange0: "10",
EndRange0: "20",
StartRange1: "30",
EndRange1: "40",
StartRange2: "60",
EndRange2: "70",
};
const format = (obj) => {
const { Type, Name, ...rest } = obj;
const list = [];
const keys = Object.keys(rest);
for (let index = 0; index < keys.length; index++) {
const start = rest[`StartRange${index}`];
const end = rest[`EndRange${index}`];
if (start && end) {
list.push([start, end]);
} else {
break; // assuming you don't have any other elements
}
}
return {
[Type]: {
Name,
List: list,
},
};
};
console.log(JSON.stringify(format(test)));