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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
​
 
function add(objToPush){
return (!arr.find(o => 
  objToPush.start < o.start !==
    objToPush.end > o.end
))?arr.push(objToPush):false;
}
​
let arr = [
    {
        start: 0,
        end: 10
    },
    {
        start: 30,
        end: 40
    },
    {
        start: 60,
        end: 70
    },
    {
        start: 100,
        end: 110
    },
    {
        start: 140,
        end: 150
    },
    {
        start: 180,
        end: 190
    }
];
​
console.log(
add({
    start: 45,
    end: 50
}),
add({
start:5,
end:10
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