Javascript Array to Sentence

Question

如何在Javascript中將數組（例如["Susy", "John", "Mary"]）轉換爲"Susy, John, and Mary"？我無法將Ruby的to_sentence方法從我的腦海中解放出來。

Answer 1

加入所有項目除了最後一個，然後加上一句：

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

演示：http://jsfiddle.net/JYKcK/1/

Answer 2

可以使用。加入（），並用預先準備的最後一個值 「和」

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 3

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

Answer 4

修改最後再加入

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

Answer 5

試一下：

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

MORE。我不嘗試，但你應該明白我的意思

Answer 6

而另一種解決方案：

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

或只是定義在你的紅寶石般的句子方法陣列的原型：

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 7

另一種選擇，使用Array.prototype.reduce，應該是：

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

主要生產"1, 2 and 3"。

Answer 8

有一些額外的情況下，在這一個：

1. 難道我們希望有「和」（牛津逗號）之前一個逗號
2. 無論哪種方式，我們不希望一個逗號，如果只有2個元素
3. 如果只有1元，我們只想說一句話返回

我認爲這符合所有這些用例：

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 9

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

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

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