Coding Challenge Practice - Question 89

The task is to implement a function that determines the type of data.

The boilerplate code

function detectType(data) {
  // your code here
}

The process involved in determining the type of data is to check for all kinds of data types. To check if the data is null

if(data === null) return 'null';

To check if the data is a number

if(data instanceof Number) return 'number';

To check if the data is a string

if(data instanceof String) return 'string';

To check if the data is a boolean

if(data instanceof Boolean) return 'boolean';

To check if the data is a date

if(data instanceof Date) return 'date';

To check if the data is a regular expression

if(data instanceof RegExp) return 'regexp';

To check if the data is a set

if(data instanceof Set) return 'set';

To check if the data is a map

if(data instanceof Map) return 'map';

To check if the data is a function

if(data instanceof Function) return 'function';

To check if the data is an array

if(Array.isArray(data)) return 'array';

To check if the data is an array buffer

if(data instanceof ArrayBuffer) return 'arraybuffer';

To check if the data is primitive

const type = typeof data;
  if (type !== 'object') return type;

All data types have been accounted for. The final code

function detectType(data) {
  // your code here
  if(data === null) return 'null';

  if(data instanceof String) return 'string';

  if(data instanceof Number) return 'number';

  if(data instanceof Boolean) return 'boolean';

  if(Array.isArray(data)) return 'array';

  if(data instanceof Date) return 'date';

  if(data instanceof RegExp) return 'regexp';

  if(data instanceof Map) return 'map';

  if(data instanceof Set) return 'set';

  if(data instanceof Function) return 'function';

  if(data instanceof ArrayBuffer) return 'arraybuffer';

  const type = typeof data;
  if(type !== 'object') return type;

  return typeof data;
}

That's all folks!