fus-ext

FutureScript Extension

This library runs on both Node.js and browser.

While you can use this library in normal JavaScript, it's highly recommended to use it in FutureScript.

npm install fus-ext

In node_modules/fus-ext/examples directory, there're 3 manifest files. Copy one of them to your code's directory. Rename the new file to manifest.fus if needed.

• manifest.fus: For general purposes.
• manifest-lodash.fus: Suitable if you want to bind .. to Lodash (or Underscore after modification) instead of the fus-ext built-in.
• manifest-no-op.fus: Suitable if you don't want to bind .. to anything, or you want to bind later in your own code.

You can remove some exports in the manifest. For example, you can remove assert if you want this name to bind to Node.js assert module in your own code.

Your code can be like this:

fus 2.0.5
import "./manifest" all

loop(10, i ->
    console.log "This is \(i) time"
)

Here we used the "batch import" feature. Note that the export of manifest.fus should match the import of yours. If you want to use node instead of es, then you'll need to make corresponding changes in the version line of the two files.

The following document lists the API.

global

Syntax: global

Equivalent to sys.global. Note, that Node.js global is a global variable, but this variable is local, though they are the same in practice.

sys

global

Syntax: sys.global

The global object. In browser, it's equivalent to window. In Node.js, it's equivalent to global.

feVersion

Syntax: sys.feVersion

Returns the fus-ext version.

isNode

Syntax: sys.isNode

Returns true if it's in Node.js, or false otherwise.

loop, repeat, break

loop and repeat are similar. The only difference is that repeat returns the results as an array while loop returns void. So, repeat make cause performance issue if you run a huge number of cycles. For example, if there're 1,000,000,000 cycles and you use repeat, then the results array will be too big.

If the iterator returns break then it means to jump out of the loop, similar to JS's break, but different in essence. Here break is an expression, and only capable of cancelling the remaining cycles, not capable of cancelling the remaining part of the function. If break then the loop or repeat function returns break. This example is a loop, from 0 to 9, but it will jump out on 5:

loop(10, i ->
    if i < 5
        console.log "This is \(i) time"
    else
        break
)

If no count is set, it means forever, equivalent to JS's while (true):

loop --
    if abc()
        break
    else
        doSomething()

The following corresponds to JS's for loop, from 1 to 10:

loop{1 to 10 for i ->
    console.log i
}

The following corresponds to JS's for loop, from 10 to 1:

loop{10 to 1 by -1 for i ->
    console.log i
}

The following will output [1, 3, 5, 7, 9]:

console.log repeat{1 to 10 by 2}

The following will output [0, 1, 2, 3, 4]:

console.log repeat(5)

The following will output [2, 3, 4, 5, 6]:

console.log repeat(5, i -> i + 2)

enum

This can simulate the enum type in many other languages. For example:

Color: enum{red, green, blue}

console.log(Color.red, Color.green, Color.blue)

This will output 0 1 2.

compose

Syntax 1: compose(function1, [function2, ...])

Syntax 2: compose(functionArray)

Returns the math composition of functions. Functions can be passed as multiple arguments, or a single array argument. For example:

a: compose(Math.min, Math.abs)
console.log a(-2, -3)

This will output 3.

spread

Syntax: spread(value, count)

Returns a length=count array. In this array each element is value.

For example, spread(0, 3) will be [0, 0, 0]

fail

Syntax: fail([errorMessage])

Shorthand function for throw Error(errorMessage). So you can write fail() in many use cases.

assert

This function is equivalent to Node.js assert function, but it also works in browser.

web

request

Syntax: web.request(options)

This low-level method underlies all other methods, returning a promise of response. For options, it can contain the following properties:

• method: Required. Must be a string, such as "GET", "POST", etc.
• uri: Required. Must be a string.
• headerFields: Optional. It's an object with header fields as properties.
• body: Optional. It's a string or a Uint8Array instance.
• timeout: Optional. It's a number in milliseconds. Defaults to never.
• responseBodyType: Optional. "text", "json" or "binary". Defaults to "text". The program will do some conversion when returning response, if needed.

get

Syntax: web.get(uri, [options])

Do HTTP GET for the uri, returning a promise of a response. Options valid in web.request are also valid in this method.

jsonGet

Syntax: web.jsonGet(uri, [options])

Do HTTP GET for the uri, returning a promise of a response with its body represented as a JSON value. Options valid in web.request are also valid in this method.

binaryGet

Syntax: web.binaryGet(uri, [options])

Do HTTP GET for the uri, returning a promise of a response with its body represented as a Uint8Array instance. Options valid in web.request are also valid in this method.

post

Syntax: web.post(uri, body, [options])

Do HTTP POST for the uri and body, returning a promise of a response. body can be string or Uint8Array instance. Options valid in web.request are also valid in this method.

jsonPost

Syntax: web.post(uri, body, [options])

Do HTTP POST for the uri and body, returning a promise of a response with its body represented as a JSON value. The argument body must be also a JSON value, which will be stringified by the library before sending. Options valid in web.request are also valid in this method.

feString

Under development.

feArray

Under development.