Typescript Helpers v0.3.5

Provides helper functions and extension methods for Typescript

Installation:

In npm:

$ npm i @evan-abc/typescript-helpers --save-dev

In yarn:

$ yarn add -D @evan-abc/typescript-helpers

Extension Methods

Array

First:

Gets the first element in the array. Returns undefined if it is not found.

const arr = [1,2,3]
arr.first() // 1

Last:

Gets the last element in the array. Returns undefined if it is not found.

const arr = [1,2,3]
arr.last() // 3

Boolean

Switches a true boolean to false and a false boolean to true.

Not:

const bool = true
bool.not() // false

Number

Seconds:

Converts numbers representing seconds into milliseconds.

const num  = 5
num.seconds() // 5000

Object

Matches:

Checks that two object match. This extension method has a optional flag argument to check if the two object match when stringified (i.e. that the contents of the two objects matches). It defaults to true

const obj1 = { first: 1, last: 2 }
const obj2 = { first: 1, last: 2 }
obj1.matches(obj2) // true
obj1.matches(obj2, false) // false

String

Capitalize:

Capitalizes the first letter of a string.

const str = "hello world"
str.capitalize() // "Hello world"

Truncate:

Truncates the string to the size specified

const str = "hello world
str.truncate(3) // "Hel..."

Helpers

Wait:

Used to wait a given amount of milliseconds. Default time is 2000ms.

wait(5000) // waits for 5 seconds

Assert:

Throws given error if predicate is not true.

const predicate = false
const error = new Error("Something is wrong!")

assert(predicate, error) // throws error "Something is wrong!"