Overlap

index.js

// input:
// 0           4                         9                 10
// <-----------|-------------------------|---------------->
//       true             false                true
// [[0,4,true],[4,9,false],[9,10,true]]

// 0                       6                               10
// <-----------------------|------------------------------>
//             true                     false
// [[0,6,true],[6,10,false]]
 
// output:
// 0           4           6             9                 10
// <-----------|-----------|-------------|---------------->
//      true       false        false         false

const multiRange = (range1, range2) => {
    var output = [];
    for (var i = j = 0, out; i < range1.length && j < range2.length;) {
        
        out = [
            Math.max(range1[i][0], range2[j][0]),
            Math.min(range1[i][1], range2[j][1]),
            range1[i][2] && range2[j][2]
        ];
        out[1] === range1[i][1] ? i++ : j++;
        output.push(out);
    }
    
    return output;
}
const output = multiRange([[0,4,true],[4,9,false],[9,10,true]], [[0,6,true],[6,10,false]]);

console.log(output);
/*
[ [ 0, 4, true ],
  [ 4, 6, false ],
  [ 6, 9, false ],
  [ 9, 10, false ] ]
*/