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How do I get results? [closed]

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I am a beginner in JavaScript and I write the following code, I also write console.log(), and I do not get results, can someone help me and explain to me why I can't get results?
function integers() {
let MyArray;
MyArray = [];
for (let i = 2; i <= 10; i++) {
MyArray.push(i);
}
console.log(MyArray);
}

The javascript functions are not being called automatically. If you need to do so, You can create an auto call function - https://stackoverflow.com/a/10704006/7078456
Or you can manually call your function to get the output of your function.
function integers() {
let myArray = [];
for (let i = 2; i <= 10; i++) {
myArray.push(i);
}
console.log(myArray);
}
integers()

How to search in localstorage for specific word and get entire key and value? [closed]

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On click i created localstorage item "storageKey__list" and value is "example.com"
I need to get all item keys and values ends with "__list" and then get entire key and value.
Result must be:
"storageKey__list , example.com"

You could grab the entries in localStorage using Object.entries() and then use .filter() to obtain only the entires ending in "__list" by using .endsWith():
Object.entries(localStorage).filter(([key]) => key.endsWith('__list'));
Output:
[["storageKey__list", "example.com"]]
A more browser friendly version of the code above could be to use the following:
Object.keys(localStorage).filter(function(key) {
return /__list$/.test(key);
}).map(function(key) {
return [key, localStorage.getItem(key)];
});
Output:
[["storageKey__list", "example.com"]]

Try this:
/** #type {[string, string][]} */
const keyValuePairs = [];
for (let i = 0, l = localStorage.length; i < l; i++) {
const key = localStorage.key(i);
if (key.endsWith("__list"))
keyValuePairs.push([ key, localStorage.getItem(key) ]);
}
console.log(keyValuePairs);

I need to sort it out this quiz [closed]

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my code is not working at all
I need to solve this quiz
question is write convertToString as function !
this function should convert to string from parameter
ex )
let output = convertToString(120);
console.log(output); // --> '120'
let output2 = convertToString('hello');
console.log(output2); // --> 'hello'
let output3 = convertToString(true);
console.log(output3); // --> 'true'
this is what I wrote
function convertToString(anything) {
if (typeof anything === 'number' && typeof anything === 'boolean') {
let ret = anything.toString()
} else {
return anything;
}
return ret1;
}
convertToString(120);

The easiest way to convert anything is by making + operation with ""
function convertToString(anything) {
return "" + anything
}
console.log(convertToString(12));
console.log(convertToString(true));
console.log(convertToString('hello'));
console.log(convertToString(null));
console.log(convertToString(undefined));

Zero checks necessary.
function convertToString(val) {
return String(val);
// or return val.toString();
// or return '' + val;
}
console.log(convertToString(12));
console.log(convertToString(true));
console.log(convertToString('hello'));

How to declare a json object or array collection with variable size in javascript [closed]

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I need to create an array or json that can be filled when detects the counter like an auxiliarJson with variable size but i dont know how can i do it
TypeError: lAttrsPorDia is undefined
lAttrsPorDia[j] = __oATTRS[i];
var lAttrsPorDia;
var j = 0;
for (var i = 0; i < __oATTRS.length; i++) {
if (__oATTRS[i].Dia == counter) {
lAttrsPorDia[j] = __oATTRS[i];
j++;
alert(JSON.stringify(lAttrsPorDia));
}
}

JavaScript arrays already do have variable size:
var arr = [];
arr.push('Hello');

How to improve selection sort? [closed]

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This is more of an academic/homework question?
Would it be better to change
if (index_outer !== index_min) {
$P.swap(arr, index_outer, index_min);
}
to
$P.swap(arr, index_outer, index_min);
and always swap, as this is the special case when index_outer does have the smallest value? It would be a swap that does nothing, but at the same time it would not break anything. Because this does not happen often I suppose, it would reduce the amount of times an if check was used.
$P.swap = function (arr, i, j) {
var temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
};
$P.selectionSort = function (arr) {
var index_outer,
index_inner,
index_min,
length = arr.length;
for (index_outer = 0; index_outer < length; index_outer++) {
index_min = index_outer;
for (index_inner = index_outer + 1; index_inner < length; index_inner++) {
if (arr[index_inner] < arr[index_min]) {
index_min = index_inner;
}
}
if (index_outer !== index_min) {
$P.swap(arr, index_outer, index_min);
}
}
return arr;
};

I don't think it would always be a good idea. What if array was partially/fully sorted, you would be wasting a call to $P.swap().
As for improving selection sort try sorting the array from both ends simultaneously by taking index_min and index_max. Though number of comparisons would remain same, number of passes would decrease hence decreasing total run time.