JavaScript notes

Format number:
```
(123456789).toLocaleString()
```
will returns
```
123,456,789
```
Padding 0:
```
(123).toString().padStart(6, "0")
```
will returns
```
000123
```
Padding spaces:
```
(123).toString().padStart(6)
```
will returns
```
   123
```
Check is substring exists:
```
("abcde").includes("bc")
```
will returns
```
true
```
Check if an item exists in an array:
```
["a","b","c"].includes("b")
```
will returns
```
true
```
Check if string starts with:
```
"abcde".startsWith("abc")
```
will returns
```
true
```
Check if string ends with:
```
"abcde".endsWith("cde")
```
will returns
```
true
```

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