javascript或node.js的string.format，sprintf（）等的coffeescript版本 [英] coffeescript version of string.format, sprintf() etc. for javascript or node.js

问题描述

如何在coffeescript中使用string.format（）或sprintf（）？

How do I string.format() or sprintf() in coffeescript?

推荐答案

String.prototype.format = ->
  args = arguments
  return this.replace /{(\d+)}/g, (match, number) ->
    return if typeof args[number] isnt 'undefined' then args[number] else match

使用一些来自害怕的JavaScript 翻译

Translated using some javascript from fearphage

然后可以这样使用：

fmt = "<p>{0} {1} (<a href='mailto:{2}'>{2}</a>)</p>"
mystring = fmt.format "Fred", "Flinstone", "[e-mail]"

mystring将会是：

mystring would then be:

<p>Fred Flinstone (<a href='mailto:[e-mail]'>[e-mail]</a>)</p>

使用＃{var}方法（对于给定的完美）不适用于字符串需要回收几次。在循环的情况下，例如：

Using the #{var} approach (while perfect for example given) doesn't work with a string that needs to be recycled several times. In a looping situation for example:

  HTML_header       = fs.readFileSync('includes/notify/header.html').toString()
  HTML_managerOpen  = fs.readFileSync('includes/notify/managerOpen.html').toString()
  HTML_student      = fs.readFileSync('includes/notify/student.html').toString()
  HTML_managerClose = fs.readFileSync('includes/notify/managerClose.html').toString()
  HTML_footer       = fs.readFileSync('includes/notify/footer.html').toString()

HTML_final = HTML_header

   getter2 = (r, callback) ->
      HTML_final += HTML_managerOpen.format r.EMAIL, r.FNAME, r.LNAME, r.STUDENTS.length, r.PHONE, r.MEMAIL, r.MFNAME, r.MLNAME
      async.forEachSeries r.STUDENTS, getter3, (err) ->
        HTML_final += HTML_managerClose
        callback null

    getter3 = (r, callback) ->
      HTML_final += HTML_student.format r.EMAIL, r.FNAME, r.LNAME, r.PHONE, r.DESCRIPTION, r.ENROLLED, "", "", "", "", "", "", r.CERTEXAMSCORE, r.COIKEY
      callback null

async.forEachSeries results, getter2, (err) ->
  cback null, HTML_final + HTML_footer

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