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In the language Scala, early versions allowed curly braces only. Scala 3 added an option to use indenting to structure blocks. Scala 3 added an option to use indenting to structure blocks. Designer Martin Odersky said that this was the single most important way Scala 3 improved his own productivity, that it makes programs over 10% shorter and ...
In computer programming, indentation style is a convention, a.k.a. style, governing the indentation of blocks of source code.An indentation style generally involves consistent width of whitespace (indentation size) before each line of a block, so that the lines of code appear to be related, and dictates whether to use space or tab characters for the indentation whitespace.
In C, strings are normally represented as a character array rather than an actual string data type. The fact a string is really an array of characters means that referring to a string would mean referring to the first element in an array. Hence in C, the following is a legitimate example of brace notation:
More generally, curly braces are used to group words together into a single argument. [ 10 ] [ 11 ] In Tcl, the word while takes two arguments, a condition and an action . In the example above, while is missing its second argument, its action (because the Tcl also uses the newline character to delimit the end of a command).
Haskell, like Python, has the off-side rule. It has a two-dimension syntax where indenting is meaningful to define blocks (although, an alternate syntax uses curly braces and semicolons). Haskell is a declarative language, there are statements, but declarations within a Haskell script. Example:
A curly bracket or curly brace language has syntax that defines a block as the statements between curly brackets, a.k.a. braces, {}. This syntax originated with BCPL (1966), and was popularized by C. Many curly bracket languages descend from or are strongly influenced by C. Examples:
In C, blocks are delimited by curly braces - "{" and "}". ALGOL 68 uses parentheses. Parentheses - "(" and ")", are used in the MS-DOS batch language; indentation, as in Python; s-expressions with a syntactic keyword such as prog or let (as in the Lisp family)
This article focuses on curly-bracket languages (that delimit blocks with curly brackets, a.k.a. curly braces, a.k.a. braces) and in particular C-family languages Why is Python, a notably non-curly bracketed language, being added to the "Notable Styles" section article?