Checking For Range Overlap

I am trying to implement a function which, when given two objects that represent lines, returns whether they overlap or not. Here is how it should look like visually. Example 1: ch

Solution 1:

Nina Scholz answer won't work, eg. a = {start: 1, end: 2}, b = {start: 0, end: 10}.

If lines {start: 0, end: 10} and {start: 10, end: 15} are count as overlapping:

functioncheckOverlap(lineA, lineB) {
        return lineA.start >= lineB.start && lineA.start <= lineB.end || 
               lineA.end >= lineB.start && lineA.end <= lineB.end ||
               lineB.start >= lineA.start && lineB.start <= lineA.end || 
               lineB.end >= lineA.start && lineB.end <= lineA.end;
    }

If not:

functioncheckOverlap(lineA, lineB) {
        return lineA.start > lineB.start && lineA.start < lineB.end || 
               lineA.end > lineB.start && lineA.end < lineB.end ||
               lineB.start > lineA.start && lineB.start < lineA.end || 
               lineB.end > lineA.start && lineB.end < lineA.end;
    }

Solution 2:

You could check against the borders of an object.

functioncheckOverlap(o1, o2) {
    return (
       o1.start >= o2.start && o1.start <= o2.end ||
       o1.end >= o2.start && o1.end <= o2.end ||
       o2.start >= o1.start && o2.start <= o1.end ||
       o2.end >= o1.start && o2.end <= o1.end
    );
}

console.log(checkOverlap({start: 0, end: 10}, {start: 8, end: 15}));   // trueconsole.log(checkOverlap({start: 8, end: 15}, {start: 0, end: 10}));   // trueconsole.log(checkOverlap({start: 12, end: 15}, {start: 0, end: 10}));  // falseconsole.log(checkOverlap({start: 0, end: 10}, {start: 12, end: 15}));  // falseconsole.log(checkOverlap({start: 12, end: 15}, {start: 16, end: 17})); // falseconsole.log(checkOverlap({start: 16, end: 17}, {start: 12, end: 15})); // falseconsole.log(checkOverlap({start: 1, end: 2}, {start: 0, end: 10}));    // trueconsole.log(checkOverlap({start: 0, end: 10}, {start: 1, end: 2}));    // trueconsole.log(checkOverlap({start: 0, end: 10}, {start: 10, end: 20}));  // trueconsole.log(checkOverlap({start: 10, end: 20}, {start: 0, end: 10}));  // true

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