So I have an array of strings like this:
myData = ["111", "222", "333"]
I want to build a string having this structure:
"{
"111" : [{"type" : "line"}],
"222" : [{"type" : "line"}],
"333" : [{"type" : "line"}],
}"
Basically, for each element in array to add that type and line which are the same for all, and put it inside curly brackets, all this being a string.
This is my unsuccessful approach until now:
let result ="{";
myData.forEach(
result = result + '"' + baselineTitle + '" [{"type":"line"}]';
);
result = result + "}"
I agree with @deceze about using JSON.stringify
, here is an example :
const object = ['111', '222', '333'].reduce((tmp, x) => { tmp[x] = [{ type: 'line', }]; return tmp; }, {}); console.log(JSON.stringify(object, null, 2));
You will notice the use of Array.reduce which is the most adequate method to use in here.
EDIT about ptr
EDIT 2 about ptr
It's better to disable the eslint no-param-reassign rule
You could generate the object first and then get a stringified version of it.
var array = ["111", "222", "333"], object = Object.assign(...array.map(k => ({ [k]: [{ type: "line" }] }))), json = JSON.stringify(object); console.log(json); console.log(object);
As I understood you want to get JSON here.
I would use JSON.stringify() instead of generating it manually. Also I would use reduce method instead of forEach
.
const myData = ['111', '222', '333']; const result = JSON.stringify(myData.reduce(function(accumulator, currentValue){ accumulator[currentValue] = [{type: 'line'}]; return accumulator; }, {})); console.log(result);
use reduce .
const result = ["111", "222", "333"].reduce((prev, curr) => Object.assign(prev, {[curr]: [{type:'line'}]}), {}); console.log(result);
You can use reduce to transform an array into an object like this:
const data = ['111', '222', '333']; const result = data.reduce((acc, value) => ( { ...acc, [`${value}`]: [{type: 'line'}] } ), {}); console.log(JSON.stringify(result));
And I decided to use pure stateless functional programming for the reduce case (without modifying any scope variable).
Check the following snippet
const myData = ["111", "222", "333"] const result = {} for( const item of myData) { result[item]=[]; result[item].push({"type" : "line"}); } console.log(result)
The forEach loop takes a function as argument, you did not specify arguments and the function itself, a solution would be like this :
let result ="{";
myData.forEach((baselineTitle) => {
result = result + '"' + baselineTitle + '" [{"type":"line"}]';
});
result = result + "}"
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