JavaScript sprintf

JavaScript sprintf – Dive Into JavaScript.

string sprintf(string format , [mixed arg1 [, mixed arg2 [ ,...]]]);

The placeholders in the format string are marked by “%” and are followed by one or more of these elements, in this order:

  • An optional “+” sign that forces to preceed the result with a plus or minus sign on numeric values. By default, only the “-” sign is used on negative numbers.
  • An optional padding specifier that says what character to use for padding (if specified). Possible values are 0 or any other character precedeed by a ‘. The default is to pad with spaces.
  • An optional “-” sign, that causes sprintf to left-align the result of this placeholder. The default is to right-align the result.
  • An optional number, that says how many characters the result should have. If the value to be returned is shorter than this number, the result will be padded.
  • An optional precision modifier, consisting of a “.” (dot) followed by a number, that says how many digits should be displayed for floating point numbers. When used on a string, it causes the result to be truncated.
  • A type specifier that can be any of:
    • % — print a literal “%” character
    • b — print an integer as a binary number
    • c — print an integer as the character with that ASCII value
    • d — print an integer as a signed decimal number
    • e — print a float as scientific notation
    • u — print an integer as an unsigned decimal number
    • f — print a float as is
    • o — print an integer as an octal number
    • s — print a string as is
    • x — print an integer as a hexadecimal number (lower-case)
    • X — print an integer as a hexadecimal number (upper-case)

sprintf() version 0.7

 

 

 

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