Take any object (null,undefined string boolean object array...) and return same object with some new values based on some rules

remapObject.js

// my backend return all date in a UTC format without "Z" at the end of string. I want to add a "Z" for all data that contain a date
// from "2020-05-21T19:51:25.396" to "2020-05-21T19:51:25.396Z"

const object: any = {
    name: "-",
    created_at: "-",
    created_when: "-",
    calendar: {
        updated_at: "-",

    },
    arr: [1,2,{
        aa_at: "-"
    }]
}

const arr = [
    object,
    object
]

function isPrimitive(test: any): boolean {
    return (test !== Object(test));
};

function remapObject(original: any){
    if(isPrimitive(original)){
        return original
    }
    if(Array.isArray(original)){
        return original.map(remapObject)
    } else {
        return Object.keys(original).reduce((acc,currentFieldName) => {
            const value = original[currentFieldName]
    
            if(isPrimitive(value)){
                if(typeof value === "string" && currentFieldName.endsWith("_at")){
                    acc[currentFieldName] = value+"Z"
                } else {
                    acc[currentFieldName] = value
                }
            } else {
                // array of object
                if(Array.isArray(value)){
                    acc[currentFieldName] = value.map(remapObject)
                } else {
                    acc[currentFieldName] = remapObject(value)
                }
                
            } 
            return acc
        },{})
    }
}

console.log(remapObject(object))
console.log('xxxxxx')
console.log(remapObject(arr))