Number-Methods

Question 1

toExponential

Answer 1

.toExponential(digit=most-specific)
=>  {str} number in exponential form rounded to the nearest `digit`
#safe

digit

• number of digits after the decimal point (last digit is rounded)
• if omitted, no rounding
• range 0 - 20, else throws RangeError

Question 2

toFixed

Answer 2

.toFixed(num digit=0)
=>  {str} number w/ fixed-point notation
#safe

digit

• number of digits after the decimal point to include (last digit is rounded), padded with 0’s if needed
• range 0 - 20, else throws RangeError

Question 3

toPrecision

Answer 3

.toPrecision(num precision=most-precise)
=>  {str} number w/ precise number of digits, either fixed-point or exponential notation
#safe

precision

• if omitted, .toPrecision() === .toString()
• range 0 - 100, else throws RangeError; however, older ES versions required up to 21, which some implementations still adhere to (V8).

Question 4

toString

Answer 4

.toString(num base=10)
=>  {str} number at base of `base`
#safe
#example:
  (2).toString(2) => '10'

base

• range 2 - 36, else throws RangeError
• (2 - binary, 16 - hexadecimal, etc.)

Question 5

valueOf

Answer 5

.valueOf()
=>  {num} primitive number value
#safe