my.js

this.remoteLoggingOptions = ['warn', 'info', 'error', 'debug'];

const form = {
  value: {
    waitTime: 300,
    maxMsgs: 100,
    warn: true,
    info: true,
    debug: false,
    error: false
  }
}    

const remoteLoggingModel = {
  key: 'loggerRemoteLevels',
  value: ''
}

const formValue = form.value; // model values coming from ngForm model

let modelKeys = Object.keys(formValue);
let transformedObject = modelKeys.reduce((result, current) => {
    let value = formValue[current]; // current model value

    // remoteLoggingOptions are comma separated options
    // 'warn,error' | 'warn,info,debug,error'
    if (_.includes(this.remoteLoggingOptions, current) && value) {
      result.push({
        key: 'loggerRemoteLevels',
        value: current
      });
    }

    if (current === 'waitTime') {
      result.push({
        key: 'loggerRemoteWaitTime',
        value: value
      });
    }

    if (current === 'maxMsgs') {
      result.push({
        key: 'loggerRemoteMaxMsgs',
        value: value
      });
    }

    return result;
  }, []);

let otherRemoteLoggingOptions = _.reject(transformedObject, (current) => {
  return current.key === 'loggerRemoteLevels'
})

let getLoggerRemoteLevels = _(transformedObject)
  .filter(function(currentObj) {
    return currentObj.key === 'loggerRemoteLevels'
  })
  .map('value')
  .value();

let remoteLoggingOptions = {
  value: getLoggerRemoteLevels.join(',')
}

let finalRemoteLoggingModel = _.assign(remoteLoggingModel, remoteLoggingOptions)

let finalRemoteLoggingOptions = otherRemoteLoggingOptions.concat(finalRemoteLoggingModel)