@lunaticmuch/front-matter-manipulator/lib/util/parseField.js

A utility for parsing and manipulating documents with Front Matter

import isMissing  from './isMissing.js';
export default function parseField(field, data) {
    if(isMissing(field)) throw new Error('Missing value for "field"');
    
    var split = field.split('.');
    var totalSubFields = split.slice(1);
    var currentField = split[0];
    var subFields = totalSubFields.join('.');
    var fieldValue = null;

    if (data) {
        fieldValue = data[currentField];
    }

    return {
        split: split,
        totalSubFields: totalSubFields,
        currentField: currentField,
        subFields: subFields,
        fieldValue: fieldValue
    };
}