Number object

• Convert strings into numbers
• Convert numbers into strings
• Use methods of the JavaScript Number object
• Use built-in Number object constants

• parseInt(string): looks for a valid integer starting at the beginning of the string and returns it as a number if found, or NaN if none is found; ignores the string past the first valid integer
• parseInt(string, radix): looks for a valid integer in base radix starting at the beginning of the string and returns it as a number if found, or NaN if none is found; ignores the string past the first valid integer
• parseFloat(string): looks for a valid floating point number starting at the beginning of the string and returns it as a number if found, or NaN if none is found; ignores the string past the first valid floating-point number
• .toString(): returns the string representation of the numeric value contained in the number object it is called on
• .toString(radix): returns the string representation of the numeric value contained in the number object it is called on; the number should be in base radix, but there is no guarantee
• .toExponential(n): returns a representation of the number object in exponential format using n digits after the decimal
• .toFixed(n): returns a representation of the number object using n digits after the decimal
• .toPrecision(n): returns a representation of the number object using n digits of significance
• .valueOf(): returns the primitive numeric value of the number object
• you can convert a string to a number by prepending a + sign
• you can convert a string to a number by multiplying by 1

• Number.EPSILON: the smallest interval between two representable numbers
• Number.MIN_SAFE_INTEGER: the smallest safe integer
• Number.MAX_SAFE_INTEGER: the largest safe integer
• Number.MAX_VALUE: the largest positive number JavaScript can represent
• Number.MIN_VALUE: the smallest positive number JavaScript can represent
• Number.POSITIVE_INFINITY: positive infinity (occurs on overflow)
• Number.NEGATIVE_INFINITY: negative infinity (occurs on overflow)
• Number.NaN: special value representing "not a number"
• Number.NEGATIVE_INFINITY: special value representing negative infinity
• Number.POSITIVE_INFINITY: special value representing positive infinity

• isNaN: determines if a value is NaN
• isFinite: determines if a value is a finite number
• isInteger: determines if a value is an integer
• isSafeInteger: determines if a value is an integer in the safe integer range
• parseFloat: converts text to a float
• parseInt: converts text to an integer, can specify radix
• toExponential: returns a string representation in exponential form
• toFixed: returns a string representation in fixed-point form
• toPrecision: returns a string representation with the specified precision
• toString: returns a string representation, can specify radix
• toValue: returns the primitive value