30-seconds-of-code/snippets/size.md

size

Get size of arrays, objects or strings.

Get type of value (array, object or string). Use length property for arrays. Use length or size value if available or number of keys for objects. Use size of a Blob object created from value for strings.

Split strings into array of characters with split('') and return its length.

const size = value =>
  Array.isArray(value)
    ? value.length
    : value && typeof value === 'object'
      ? value.size || value.length || Object.keys(value).length
      : typeof value === 'string' ? new Blob([value]).size : 0;

size([1, 2, 3, 4, 5]); // 5
size('size'); // 4
size({ one: 1, two: 2, three: 3 }); // 3