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Universal grammar takes into account general formal structures and features that are common to all dialects and languages, and the template of which pre-exists in the mind of an infant child. This idea is based on the theory of generative grammar and the formal school of linguistics, whose proponents include Noam Chomsky and those who follow his theory and work.

"We may as individuals be rather fond of our own dialect. This should not make us think, though, that it is actually any better than any other dialect. Dialects are not good or bad, nice or nasty, right or wrong– they are just different from one another, and it is the mark of a civilised society that it tolerates different dialects just as it tolerates different races, religions and sexes." online cheap quality wide range of sale online K Jacques chunky cross strap sandals kgrZRHU2

Discourse is language as social practice (Baynham, 1995) and is a multilayered concept. As a social practice, discourse embodies different ideologies through written and spoken texts. Discourse analysis can examine or expose these ideologies. Discourse influences genre, which is chosen in response to different situations and finally, at micro level, discourse influences language as text (spoken or written) at the phonological or lexico-grammatical level. Grammar and discourse is often like and together it is a sort of system. [32] A particular discourse becomes a language variety when it is used in this way for a particular purpose, and is referred to as a sale classic Petar Petrov Sacha laced ankle boots fashionable cheap price discount best wholesale wTwzD3
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, and at times through the use of style too. People in the medical fraternity, for example, may use some medical terminology in their communication that is specialized to the field of medicine. This is often referred to as being part of the "medical discourse", and so on.

When a dialect is documented sufficiently through the linguistic description of its grammar, which has emerged through the consensual laws from within its community, it gains political and national recognition through a country or region's policies. That is the stage when a language is considered a standard variety, one whose grammatical laws have now stabilised from within the consent of speech community participants, after sufficient evolution, improvisation, correction, and growth. The English language, besides perhaps the French language, may be examples of languages that have arrived at a stage where they are said to have become standard varieties.

The study of a language's universal properties, on the other hand, include some of the following concepts.

Module imports and exports are fully documented on the Modules page.

Polymorphic functions in PureScript require an explicit forall to declare type variables before using them. For example, Haskell's list length function is declared like this:

In PureScript this will fail with the error Type variable a is undefined . The PureScript equivalent is:

A forall can declare multiple type variables at once, and should appear before typeclass constraints:

There is a native Number type which represents JavaScript's standard IEEE 754 float and an Int which is restricted to the range of 32-bit integers. In JavaScript, the Int values and operations are generated with a |0 postfix to achieve this, e.g. if you have variables x , y , and z of type Int , then the PureScript expression (x + y) * z would compile to ((x + y)|0 * z)|0 .

PureScript has a type Unit used in place of Haskell's () . The Prelude module provides a value unit that inhabits this type.

PureScript does not provide syntactic sugar for list types. Construct list types using List from Data.List .

There is also an Array type for native JavaScript arrays, but this does not have the same performance characteristics as List . Array values can be constructed with [x, y, z] literals, but the type still needs to be annotated as Array a .

Haskell uses the IO monad to deal with side effects. In PureScript, there is a monad called Eff that serves the same purpose but can track side effects with more granularity. For example, in a Haskell program the type signature of main will be:

This doesn't tell us much specifically about what main might do. In PureScript the type may be something like this:

Now we can see from the type that main uses the file system, traces messages to the console, and does something to the current process.

For more details about using Eff, how it works, and how to define your own side effects, see this post .

PureScript can encode JavaScript-style objects directly by using row types, so Haskell-style record definitions actually have quite a different meaning in PureScript:

In Haskell a definition like this would introduce several things to the current environment:

However in PureScript this only introduces a Point constructor that accepts an object type. In fact, often we might not need a data constructor at all when using object types:

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