Chartjs-Int Array with empty value

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You can convert this string to Array, create a new function to parse the string and return it using Function constructor, but this will create an Array with undefined Objects:

function looseJsonParse(obj){
    return Function('"use strict";return (' + obj + ')')();
}
const str = "[,,3,,]";
const DataArray = looseJsonParse(str);

console.log(DataArray);

you can simply .filter() the elements if you want just only valid values in your data array:

function looseJsonParse(obj){
    return Function('"use strict";return (' + obj + ')')();
}
const str = "[,,3,,]";
const DataArray = looseJsonParse(str).filter(el => el);

console.log(DataArray);

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