JavaScript Data type conversions

var MyVar = "3.14159";

1. Converting to a string

str = someobj.tostring ()

str = "" + MyVar

2. Converting to integral type

int = ~~myvar or parseint (MyVar)

3. Convert to floating-point type

float = 1*myvar or myVar-0 or parsefloat (MyVar)

4. Convert to Boolean type

Any string with length and any number except 0 is true

BOOL =!! MyVar

In Boolean operations

False, undefineded, NULL, 0, "" Default conversion to False

True, 1, non-empty string, non-null object default conversion to True

5. Converting to an array

Array = [MyVar]

6. Convert to date

The date string must be in the form of YY/MM/DD or Yy/mm/dd HH:mm:ss, and the other form is not possible with the new date (MyVar)

7. Convert to Regular expression

New RegExp (MyVar), creating an expression to use the form of/pattern/flags.

JavaScript Data type conversions