title: What is the role of getIn with Formik?
body: <p>What exactly is the role of getIn here? Does it simply read and assign values from the defined fields?</p>
  
  <pre><code>{fileds.map(({ formikRef, ...input }) =&gt; (
      &lt;TextField
         key={formikRef}
         helperText={
         getIn(formik.touched, formikRef)
                      ? getIn(formik.errors, formikRef)
                      : ''
                  }
         value={getIn(formik.values, formikRef)}
        {...input}
        variant="outlined"
        margin="normal"
      /&gt;
  ))}
  </code></pre>