flattenObject.js | A simple function to flatten a javascript object #js

flattenObject.js

//A simple function to flatten a javascript object, with a '.' delimiter between nested levels
const flatten = (objectOrArray, prefix = '', formatter = (k) => (k)) => {
  const nestedFormatter = (k) => ('.' + k)
  const nestElement = (prev, value, key) => (
    (value && typeof value === 'object')
      ? { ...prev, ...flatten(value, `${prefix}${formatter(key)}`, nestedFormatter) }
      : { ...prev, ...{ [`${prefix}${formatter(key)}`]: value } });

  return Array.isArray(objectOrArray)
    ? objectOrArray.reduce(nestElement, {})
    : Object.keys(objectOrArray).reduce(
      (prev, element) => nestElement(prev, objectOrArray[element], element),
      {},
    );
};