HTML and CSS Reference
15. How to create a Math object.
16. How to use the properties of the Math object.
17. How to randomly select an array element.
18. How to control the number of decimal places in a number.
19. How to define a wrapper object.
20. How to find a character in a string.
21. How to find a substring in a string.
22. The meaning of NaN .
23. How to convert a number to a string.
24. How to get the square root of a number.