printf-ts

pure typescript implementation of printf-family with type checking

Usage
import { printf } from 'printf-ts';
printf("Hello %s %d %.2lf", "printf", 1, 1.2)
Features
1. vsprintf(format, args: [...]): string
2. sprintf(format, ...args: [...]): string
3. vprintf(format, args: [...]): number
4. printf(format, ...args: [...]): number
5. vprintfln(format, args: [...]): number
6. printfln(format, ...args: [...]): number
- 1 ~ 2 Returns the result as a string
- 3 ~ 4 Writes the results to the stdout, returns the number of characters printed
- 5 ~ 6 Writes the results to the stdout, returns the number of characters printed. if nodejs, append
\n
to the end(not affect to return value)
Supported format specifiers
see cppreference-printf for each description of specifier
- flags:
+
, -
,
, #
, 0
width
, precision
- length modifier:
h
, hh
, l
, ll
, L
, j
, z
, t
- conversion specifier:
%c
, %s
, %d
, %i
, %u
, %o
, %x
, %X
, %f
, %F
, %e
, %E
, %g
, %G
, %p
, %%
types
- if argument is negative and format specifier is unsigned, it will not convert to unsigned type
- argument is not converted to a number of specific bits
- if origin type was unsigned, find it in signed type
%c | string | str[0] ?? '' |
%c | number | utf8 code point |
%s | string | |
%n | null | please use sprintf(...).length |
integer
%d, %i, %u, %o, %x, %X
short|int
-> number
long|long long|intmax_t|ssize_t|ptrdiff_t
-> bigint
Floating point
%f, %F, %e, %E, %g, %G
double|long double
-> number
- if value in [
infinity
, -infinity
, NaN
]
- if specifier is uppercase(
F
,E
,G
,A
) => "INF"
, "-INF"
, "NAN"
- else =>
"inf"
, "-inf"
, "nan"
- NaN always treated as a positive value
Pointer
%p
void*
-> bigint
- if value is
0n
=> "(nil)"
- else =>
"0x" + value.toString(16)
Wildcard
*