src/string/placeholder.js
function placeholder (input, property) {
  return ( input === undefined || input === '' || input === null ) ? property : input;
}
function placeholder (input, property) {
  return ( input === undefined || input === '' || input === null ) ? property : input;
}
function placeholder ( input , property ) { return ( input === undefined || input === '' || input === null ) ? property : input ; }
If the value is missing outputs the placeholder text

'' => {placeholder}
'foo' => 'foo'
If the value is missing outputs the placeholder text