Number
Prototype extends native JavaScript numbers in order to provide:
ObjectRangecompatibility, throughNumber#succ.- Ruby-like numerical loops with
Number#times. - Simple utility methods such as
Number#toColorPartandNumber#toPaddedString.
What becomes possible
$R(1, 10).each(function(index) {
// This gets invoked with index from 1 to 10, inclusive
});
(5).times(function(n) {
// This gets invoked with index from 0 to 5, *exclusive*
// The parentheses are due to JS syntax, if we did not use a literal, they'd be superfluous
});
(128).toColorPart()
// -> '80'
(10).toColorPart()
// -> '0a'
'#' + [128, 10, 16].invoke('toColorPart').join('')
// -> '#800a10'
Методы
abs
abs() -> NumberReturns the absolute value of the number.
ceil
ceil() -> NumberReturns the smallest integer greater than or equal to the number.
floor
floor() -> NumberReturns the largest integer less than or equal to the number.
round
round() -> NumberRounds the number to the nearest integer.
succ
succ() -> NumberReturns the successor of the current Number, as defined by current + 1. Used to make numbers compatible with ObjectRange.
times
times(iterator) -> NumberEncapsulates a regular [0..n[ loop, Ruby-style.
toColorPart
toColorPart() -> StringProduces a 2-digit hexadecimal representation of the number (which is therefore assumed to be in the [0..255] range). Useful for composing CSS color strings.
toJSON
toJSON() -> StringReturns a JSON string.
toPaddedString
toPaddedString(length[, radix]) -> StringConverts the number into a string padded with 0s so that the string’s length is at least equal to length. Takes an optional radix argument which specifies the base to use for conversion.