How to use proxy in js with example

 const obj = {
    age_int: 2,
    name_string: '1',
    job: null,
}

function isInt(n){
    return Number(n) === n && n % 1 === 0;
}

function isFloat(n){
    return Number(n) === n && n % 1 !== 0;
}

function validate(type,value){
  if (type === "bool" && typeof value !== 'boolean') {
          throw new Error('The value must be boolean')
        }
        else if (type === "string" && !(typeof value  === 'string' || target[property] instanceof String)) {
          throw new Error('The value must be String')
        }
        else if (type === "int" && !isInt(value)) {
          throw new Error('The value must be int')
        }
        else if (type === "float" && !isFloat(value)) {
          throw new Error('The value must be float')
        }
        else if (type === "number" && !(isFloat(value) || isInt(value) )) {
          throw new Error('The value must be number')
        }
}

const handler = {
    get(target, property) {
        let propertyArr = property.split('_');
        let propType = propertyArr[1];
        console.log('inside GET', propType, target[property]);
        validate(propType,target[property]);
        return target[property]; 
    },
    set(target, property, value) {
        
        let propertyArr = property.split('_');
        let propType = propertyArr[1];
        console.log('inside SET', propType, target[property]);
        validate(propType,value);
        console.log('setting vlaue',target,property, value)
        target[property] = value;  
        
        return true;    
    }
}

function typeCheck(object) {
    const d = new Proxy(object, handler);
    for (const property in d) {
      console.log(`${property}: ${d[property]}`);
    }
    return d;
}

let validatingObject = typeCheck(obj);
validatingObject.nn_bool = true;

console.log('--------',validatingObject)