Python的格式（）函数的JavaScript等价物？ [英] JavaScript equivalent of Python's format() function?

问题描述

Python有这个漂亮的函数来打开这个：

pre $ bar $ ='foobar'
bar2 ='jumped'
bar3 ='dog'

foo ='懒惰的'+ bar3 +''+ bar2'在'+ bar1
＃懒惰的狗跳过foobar

到这里：

  bar1 ='foobar'
 bar2 ='jumped'
 bar3 ='dog'
 
 foo ='懒惰{} {} {}格式（bar3，bar2，bar1）
＃懒狗跳过foobar 
  

JavaScript有这样的功能？如果没有，我将如何创建一个遵循与Python的实现相同的语法？

解决方案

另一种方法，使用 String.prototype.replace 方法，以replacer函数作为第二个参数：

  String.prototype.format = function（）{
 var i = 0，args = arguments; 
 return this.replace（/ {} / g，function（）{
返回typeof args [i]！='undefined'？args [i ++]：''; 
}）; 
}; 
 
 var bar1 ='foobar'，
 bar2 ='jumped'，
 bar3 ='dog'; 
 $ b $ {} {}格式（bar3，bar2，bar1）上的延迟{} {} 
 //懒狗跳过foobar
  

Python has this beautiful function to turn this:

bar1 = 'foobar'
bar2 = 'jumped'
bar3 = 'dog'

foo = 'The lazy ' + bar3 + ' ' + bar2 ' over the ' + bar1
# The lazy dog jumped over the foobar

Into this:

bar1 = 'foobar'
bar2 = 'jumped'
bar3 = 'dog'

foo = 'The lazy {} {} over the {}'.format(bar3, bar2, bar1)
# The lazy dog jumped over the foobar

Does JavaScript have such a function? If not, how would I create one which follows the same syntax as Python's implementation?

解决方案

Another approach, using the String.prototype.replace method, with a "replacer" function as second argument:

String.prototype.format = function () {
  var i = 0, args = arguments;
  return this.replace(/{}/g, function () {
    return typeof args[i] != 'undefined' ? args[i++] : '';
  });
};

var bar1 = 'foobar',
    bar2 = 'jumped',
    bar3 = 'dog';

'The lazy {} {} over the {}'.format(bar3, bar2, bar1);
// "The lazy dog jumped over the foobar"

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