@tpluscode/sparql-builder/lib/expressions/union.js

Simple JS library to build SPARQL queries

import { sparql } from '@tpluscode/rdf-string';
export function UNION(...[first, ...rest]) {
    if (rest.length === 0) {
        return sparql `${first}` || '';
    }
    return rest.reduce((previousValue, currentValue) => {
        return sparql `${previousValue} UNION {
      ${currentValue}
    }`;
    }, sparql `{ 
    ${first} 
  }`);
}