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rapper-utils

v1.0.2

Published

## Installation ```javascript npm install -g rapper-utils ```

Readme

这是一个提供了函数组合、函数柯里化和一些常用函数的工具库

Installation

npm install -g rapper-utils

Usage

var R = require('rapper-utils');

函数柯里化 (currying)

/*例一:声明一个替换空格的函数*/
//柯里化replace函数
var replace = R.curry(function(reg, replacement, str) {
    	return str.replace(reg, replacement);
	});

var replaceSpace = replace(/\s+/g, 'Space');

//调用
var space = " gang ";
space = replaceSpace(space);
console.log(space); //output: SpacegangSpace;空格被替换成了Space

/*例二:声明一个对数组每一项加一的函数*/
//柯里化map函数
var map = curry(function(fn, arr){
		return arr.map(fn);
	});

var mapAdd = map(function(item){
		return item + 1;
	});

//调用
var arr = [1,2,3];
arr = mapAdd(arr);
console.log(arr);	//output:[2,3,4];

纯函数组合 (composing)

var greeting = function(firstName, lastName){
	return 'My name is' + lastName + ',' + firstName;
}
var toUpper = function(str){
	return str.toUpperCase();
}
var repeat = function(str){
	return str.repeat(2);
}

//上面三个函数是干嘛的就不说了,他们有一个特点就是都是输出一个与参数相关的值,是纯函数
//将三个纯函数组合
var composed = R.compose(repeat, toUpper, greeting);
var result = composed('Han', 'Xu');
console.log(result); //MY NAME IS XU,HANMY NAME IS XU,HAN

获取字符串字节数 (sizeof)

//这个就很简单了
var str = '爱就一个字peace';
var size = R.sizeof(str, 'utf-8');
console.log(size); //output: 20;
//在utf-8编码下,绝大多数汉字每个字符占3 Bytes。
//5个汉字再加上5个ASCII码,所以输出结果是 **3x5+5=20** Bytes 

快速排序 (quickSort)和冒泡排序 (bubbleSort)

//快速排序
var arr = [3,44,1,6,41];
var sorted = R.quickSort(arr);
console.log(sorted); //output: [1,3,6,41,44]

//冒泡排序
var arr2 = [3,44,1,6,41];
var sorted2 = R.bubbleSort(arr2);
console.log(arr2); //output: [1,3,6,41,44]