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

size

Get size of arrays, objects or strings.

Get type of value – array, object and string. Use length property for arrays. Return length or size value if available or number of object keys. 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'
    ? value.split('').length
    : 0;

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