Question

如何在Javascript中将数组（例如["Susy", "John", "Mary"]）转换为"Susy, John, and Mary"？我无法理解Ruby的to_sentence方法。

Answer 1

加入除最后一项之外的所有项目，然后添加：

var s = arr.slice(0, arr.length - 1).join(', ') + ", and " + arr.slice(-1);

演示：http://jsfiddle.net/JYKcK/1/

Answer 2

使用Array.prototype.reduce的另一个选项是：

var arr = [1,2,3];
arr.reduce(
  function(prev, curr, i){ 
    return prev + curr + ((i===arr.length-2) ? ' and ' : ', ')
  }, '')
.slice(0, -2);

制作"1, 2 and 3"。

Answer 3

这一个案例中有一些额外的案例：

我们是否想在“和”（牛津逗号）
无论哪种方式，如果只有2个元素
如果只有1个元素，我们只想返回

我认为这适用于所有这些用例：

function joinSentence( array, oxford_comma ){
  if( array.length > 1 ){
    var lastWord = " and " + array.pop();
    if( oxford_comma && array.length > 1 ){
      lastWord = "," + lastWord;
    }
  }else{
    var lastWord = "";
  }
  return array.join(", ") + lastWord;
}

Answer 4

使用最新的JavaScript（Chrome 72 +）：

new Intl.ListFormat().format(["Susy", "John", "Mary"]);

这将导致：

"Susy, John, and Mary"

Answer 5

toSentence = function(arr){ return arr.join(", ").replace(/,\s([^,]+)$/, ' and $1');};

toSentence(['dogs', 'cats']);           // => dogs and cats

toSentence(['dogs', 'cats', 'snakes']); // => dogs, cats and snakes

Answer 6

修改最后一个然后加入

var source = ["Susy", "John", "Mary"];
source.push( 'and ' +source.pop());
console.log(source.join(', '))// Susy, John, and Mary

Answer 7

试试：

var array = ['susy', 'john', 'mary'];
var last = array.pop();
var string = array.join(', ') + " and " + last;

我没试过，但你应该明白这个想法

Answer 8

您可以使用.join（）并使用“and”

添加最后一个值

var array = ['susy', 'john', 'mary'];

array[array.length-1] = 'and '+array[array.length-1];

//string is "susy, john, and mary"
var string = array.join(', ');

Answer 9

另一种解决方案：

(function(a) {
    var b = (a||(a=[])).pop(); 
    return (b ? a.length ? [a.join(", "),b] : [b] : a).join(" and ");
})(["Susy", "John", "Mary"]);

或者只是在数组的原型中定义类似ruby的句子方法：

Array.prototype.sentence = function(comma,and) {
    var b = this.pop();
    return (b ? this.length ? [this.join(comma||", "),b] : [b] : this).join(and||" and ");
};

["Susy", "John", "Mary"].sentence(); 
//"Susy, John and Mary"

["Susy", "John", "Mary"].sentence(" and ", " as well as "); 
//"Susy and John as well as Mary"

["Susy", "John", "Mary", "Helmut"].sentence(); 
//"Susy, John, Mary and Helmut"

Answer 10

var arr = ["Susy", "John", "Mary"];
var str = arr.join(", ");

Javascript数组到句子

10 个答案: