JavaScript: How to make two functions to generate HTML select (drop-down menu) and options?

#javascript
How to make two functions to generate HTML select element (drop-down list) and options?

[ultronsam]

The option function expression is called Factory function, right?

[ultronsam]

The function expression "Select" can be changed yeah? Like we can use another name, it must not have to select, yeah?

[findforme]

What is the meaning of select.size please elaborate select.size and onChange ()