A Javascript function to take a string variable in dot notation and return all entries in an option where the nested key value matches the string key.
user
here's a sample javascript function that takes a string variable in dot notation and returns all entries in an option where the nested key value matches the string key:
```javascript
function getoptionvaluebydotnotation(option, dotnotation) {
  let parts = dotnotation.split('.');
  let currentnode = option;

  for (let i = 0; i < parts.length; i++) {
    if (currentnode.hasownproperty(parts[i])) {
      currentnode = currentnode[parts[i]];
    } else {
      return null;
    }
  }

  return currentnode;
}
```
you can use this function like this:
```javascript
const option = {
  somekey: {
    nestedkey1: 'value1',
    nestedkey2: 'value2'
  },
  anotherkey: 'anothervalue'
};

const dotnotation = 'somekey.nestedkey1';
const value = getoptionvaluebydotnotation(option, dotnotation);

console.log(value); // output: 'value1'
```
assistant
Here's a sample JavaScript function that takes a string variable in dot notation and returns all entries in an option where the nested key value matches the string key:
```javascript
function getOptionValueByDotNotation(option, dotNotation) {
  let parts = dotNotation.split('.');
  let currentNode = option;

  for (let i = 0; i < parts.length; i++) {
    if (currentNode.hasOwnProperty(parts[i])) {
      currentNode = currentNode[parts[i]];
    } else {
      return null;
    }
  }

  return currentNode;
}
```
You can use this function like this:
```javascript
const option = {
  someKey: {
    nestedKey1: 'value1',
    nestedKey2: 'value2'
  },
  anotherKey: 'anotherValue'
};

const dotNotation = 'someKey.nestedKey1';
const value = getOptionValueByDotNotation(option, dotNotation);

console.log(value); // Output: 'value1'
```
assistant