Repeat Group Number Field Sum Calculation

// Set number field to use for summary
var number_field_id = 'de63-1347-d4a3';
// Set summary number field
var sum_field_id = '479f-9e40-7187';
// Set repeat group of number field
var repeat_group_id = 'd042-be15-c265';
// Update sum field with all number fields in repeat entries
function update_sum_field( options ) {
  // Set sum field total value
  var sum_field_value = 0;
  // Loop over repeat group entries
  _.each( options.repeat_value, function( repeat_entry ) {
    // Loop over repeat entry fields
    _.each( repeat_entry, function( entry_field ) {
      // Check field id for select options
      if ( entry_field.component_id == number_field_id ) {
        // Update sum field value
        sum_field_value = sum_field_value + Number( entry_field.value );
      }
    } );
  } );
  // Update sum field with value
  formyoula.form_fields[ sum_field_id ].set( { value: sum_field_value } );
}
// Listening to all field changes in an existing repeat group item
formyoula.form_entry.on( 'form:field:onRender', function( data ) {
  // Check if this is repeat group
  if ( data.view.model.get( 'component_id' ) != repeat_group_id ) return;
  // Get all repeat entries and update sum field
  update_sum_field( {
    repeat_value: data.view.model.get( 'repeat_value' )
  } );
} );
// Listening to all field changes in an existing repeat group item
formyoula.form_fields[ repeat_group_id ].on( 'repeat:item:change', function( data ) {
  // Check if field updates are available
  if ( !data || _.isEmpty( data.updated_sub_component ) ) return;
  // Get the actual field that was changed
  var component = data.updated_sub_component;
  // Check if repeat field component changes should be tracked
  if ( component.get( 'component_id' ) == number_field_id ) {
    // Get all repeat entries and update sum field
    update_sum_field( {
      repeat_value: formyoula.form_fields[ repeat_group_id ].get( 'repeat_value' )
    } );
  }
} );