Js.Float
Provide utilities for JS float
Provides functions for inspecting and manipulating float
s
The special value "Not a Number"
Tests if the given value is _NaN
Note that both _NaN = _NaN
and _NaN == _NaN
will return false
. isNaN
is therefore necessary to test for _NaN
.
Returns true
if the given value is _NaN
, false
otherwise
Tests if the given value is finite
Returns true
if the given value is a finite number, false
otherwise
(* returns [false] *)
let _ = Js.Float.isFinite infinity
(* returns [false] *)
let _ = Js.Float.isFinite neg_infinity
(* returns [false] *)
let _ = Js.Float.isFinite _NaN
(* returns [true] *)
let _ = Js.Float.isFinite 1234
Formats a float
using exponential (scientific) notation
Returns a string
representing the given value in exponential notation
Formats a float
using exponential (scientific) notation
digits specifies how many digits should appear after the decimal point. The value must be in the range [0, 20] (inclusive).
Returns a string
representing the given value in exponential notation
The output will be rounded or padded with zeroes if necessary.
Formats a float
using fixed point notation
Returns a string
representing the given value in fixed-point notation (usually)
Formats a float
using fixed point notation
digits specifies how many digits should appear after the decimal point. The value must be in the range [0, 20] (inclusive). Defaults to 0
.
Returns a string
representing the given value in fixed-point notation (usually)
The output will be rounded or padded with zeroes if necessary.
Formats a float
using some fairly arbitrary rules
Returns a string
representing the given value in fixed-point (usually)
toPrecision
differs from toFixed
in that the former will format the number with full precision, while the latter will not output any digits after the decimal point.
Formats a float
using some fairly arbitrary rules
digits specifies how many digits should appear in total. The value must between 0 and some arbitrary number that's hopefully at least larger than 20 (for Node it's 21. Why? Who knows).
Returns a string
representing the given value in fixed-point or scientific notation
The output will be rounded or padded with zeroes if necessary.
toPrecisionWithPrecision
differs from toFixedWithPrecision
in that the former will count all digits against the precision, while the latter will count only the digits after the decimal point. toPrecisionWithPrecision
will also use scientific notation if the specified precision is less than the number for digits before the decimal point.
Formats a float
as a string
Returns a string
representing the given value in fixed-point (usually)
(* prints "12345.6789" *)
let _ = Js.log (Js.Float.toString 12345.6789)
Formats a float
as a string
radix specifies the radix base to use for the formatted number. The value must be in the range [2, 36] (inclusive).
Returns a string
representing the given value in fixed-point (usually)
Parses the given string
into a float
using JavaScript semantics
Returns the number as a float
if successfully parsed, _NaN
otherwise.
(* returns 123 *)
let _ = Js.Float.fromString "123"
(* returns 12.3 *)
let _ = Js.Float.fromString "12.3"
(* returns 0 *)
let _ = Js.Float.fromString ""
(* returns 17 *)
let _ = Js.Float.fromString "0x11"
(* returns 3 *)
let _ = Js.Float.fromString "0b11"
(* returns 9 *)
let _ = Js.Float.fromString "0o11"
(* returns [_NaN] *)
let _ = Js.Float.fromString "foo"
(* returns [_NaN] *)
let _ = Js.Float.fromString "100a"