All files / src/preds oneOf.js

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module.exports = function oneOf( ) {
  var items;
 
  if ( arguments.length === 1 && Array.isArray( arguments[ 0 ] ) ) {
    items = arguments[ 0 ];
  } else if ( arguments.length > 0 ) {
    items = Array.prototype.slice.call( arguments );
  } else {
    throw new Error( 'Items list is required.' );
  }
  var fn = function oneOf( x ) {
    return items.indexOf( x ) >= 0;
  };
  fn.__predToString = () => {
    return 'oneOf('.concat( [ items.map( JSON.stringify ).join( ', ' ) ] ).concat( ')' );
  }
  return fn;
}