vue-lazy-calc
this is a simple calculation plugin in lazy way. (inspired by lodash)
features
- vue friendly
- strong typed
- lazy evaluation
- chaining methods
- code coverage 100%
TODO:
- seperate simple lazy class from base class
- support more operator in stream api
Install
npm install vue-lazy-calc --save
Quick Start
import lzCalc from "vue-lazy-calc"
Vue.use(lzCalc)
Methods
- this.$lzCalc in Component context.
- Vue.$lzCalc in global.
API list
base
export declare class LazyBase {
lazy(init?: number): LazyCalc
stream(s?: LazyCalc): LazyStream
}
- lazy => init a new instance with optional initValue
- stream => init a stream to operate between multiple lazy instance with optional init instantce
simple
export declare class LazyCalc {
add(y: number): LazyCalc
divide(y: number): LazyCalc
subtract(y: number): LazyCalc
multiply(y: number): LazyCalc
do(fn: operatorFunc): LazyCalc
ceil(precision?: number): LazyCalc
floor(precision?: number): LazyCalc
round(precision?: number): LazyCalc
default(fallback: any): LazyCalc
value(): any
}
- add/subtract/divide/multiple => + - * / (simple calculation) between numbers
- round/floor/ceil => deal with precision of the float number
- value => excute the declared method chain
- default => set default value if previous operations get NaN
- do => accept a custormized function for the number
Examples
(1+3)*2/3 with precision 2
const result = this.$lzCalc
.lazy(1)
.add(3)
.multiply(2)
.divide(3)
.round(2)
console.log(result.value()) // 2.67
const addThree = result.add(3)
console.log(addThree.value()) // 2.67+ 3 =>5.67
Stream
declare class LazyStream {
add(y: LazyCalc): LazyStream
subtract(y: LazyCalc): LazyStream
multiply(y: LazyCalc): LazyStream
divide(y: LazyCalc): LazyStream
round(precision?: number): LazyStream
ceil(precision?: number): LazyStream
floor(precision?: number): LazyStream
do(fn: operatorFunc): LazyStream
default(fallback: any): LazyStream
value(): any
}
const result = this.$lzCalc
.lazy(1)
.add(3)
.multiply(2)
.divide(3)
.round(2)
const tmp = this.$lzCalc.lazy(2).add(3)
const s = this.$lzCalc.stream(result).add(tmp)
console.log(s.value()) // 2.67 + 5 => 7.67
- when declare the result variable, no calculation excuted until value()
- you can reuse the declare variable
License
Contributors
Thanks goes to these wonderful people (emoji key):
 Vincent Guo |
This project follows the all-contributors specification. Contributions of any kind welcome!
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