Untitled

<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Hierarchical Config">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
console.clear();

const org = {
  name: "NewOrbit",
  parents: [0, 4, 27]
};

const userName = getSetting("UserName", org.parents);
console.log ("username: " + userName);

const password = getSetting("Password", org.parents);
console.log ("password: " + password);

function getSetting(name, ctx) {
  const documents = [
    { setting: "UserName", parents: [0], value: "demodrivercheck" },
    { setting: "UserName", parents: [0, 4], value: "override" },
    { setting: "UserName", parents: [0, 4, 27], value: "override an override" },
    { setting: "UserName", parents: [0, 4, 27, 28], value: "bug" },
    { setting: "UserName", parents: [0, 4, 43], value: "bug" },
    { setting: "Password", parents: [0], value: null },
    { setting: "Password", parents: [0, 4], value: "******" },
    { setting: "Unrelated", parents: [0, 4], value: "bug" },
    { setting: "Unrelated2", parents: [0], value: "bug" },
    { setting: "Unrelated3", parents: [0], value: "bug" },
    { setting: "Unrelated3", parents: [0,4], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 27], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 27, 28], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 27, 29], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 43], value: "bug" },
    { setting: "Unrelated3", parents: [0, 5], value: "bug" },
];

  // match on setting name
  const settings = documents.filter(a => a.setting === name);

  // then for [0, 4, 27] this will filter ...28 & ...43 as too specific & inapproriate respectively:
  const inContext = settings.filter((a) => match(a.parents, ctx));

  // now grab the most specific value for this org.
  const mostSpecific = inContext.sort((a,b) => b.parents.length - a.parents.length)[0];
  return mostSpecific.value;
}

function match(a,b) {
  let a1 = a.join('/');
  let b1 = b.join('/');
  return b1.startsWith(a1);
}
</script>


<script id="jsbin-source-javascript" type="text/javascript">console.clear();

const org = {
  name: "NewOrbit",
  parents: [0, 4, 27]
};

const userName = getSetting("UserName", org.parents);
console.log ("username: " + userName);

const password = getSetting("Password", org.parents);
console.log ("password: " + password);

function getSetting(name, ctx) {
  const documents = [
    { setting: "UserName", parents: [0], value: "demodrivercheck" },
    { setting: "UserName", parents: [0, 4], value: "override" },
    { setting: "UserName", parents: [0, 4, 27], value: "override an override" },
    { setting: "UserName", parents: [0, 4, 27, 28], value: "bug" },
    { setting: "UserName", parents: [0, 4, 43], value: "bug" },
    { setting: "Password", parents: [0], value: null },
    { setting: "Password", parents: [0, 4], value: "******" },
    { setting: "Unrelated", parents: [0, 4], value: "bug" },
    { setting: "Unrelated2", parents: [0], value: "bug" },
    { setting: "Unrelated3", parents: [0], value: "bug" },
    { setting: "Unrelated3", parents: [0,4], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 27], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 27, 28], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 27, 29], value: "bug" },
    { setting: "Unrelated3", parents: [0, 4, 43], value: "bug" },
    { setting: "Unrelated3", parents: [0, 5], value: "bug" },
];

  // match on setting name
  const settings = documents.filter(a => a.setting === name);

  // then for [0, 4, 27] this will filter ...28 & ...43 as too specific & inapproriate respectively:
  const inContext = settings.filter((a) => match(a.parents, ctx));

  // now grab the most specific value for this org.
  const mostSpecific = inContext.sort((a,b) => b.parents.length - a.parents.length)[0];
  return mostSpecific.value;
}

function match(a,b) {
  let a1 = a.join('/');
  let b1 = b.join('/');
  return b1.startsWith(a1);
}
</script></body>
</html>