Question

我有一个数组，我在数组中存储逗号分隔的字符串。现在我想从逗号分隔的字符串中取出每个第一个字母的字符串对于ex =＆gt; Abc, Xyz, Hji现在我想要A, X, H。

下面列出了我的代码和数组。

这是我的代码=＆gt;

var ArryString = [];
for (var i = 0; i < data.length; i++) {            
    ArryString.push(data[i].Str);
}

当前o / p =＆gt;

     "Abc"  
    "Xyz,Hji,Lol",
    "Uyi,Mno"

my expacted o / p =＆gt;

    "A" 
    "X,H,L"
     "U,M"

Answer 1

您可以拆分字符串并仅使用destructuring assignment的第一个字符并加入字符串的第一个字符。然后将新字符串映射为新数组。

＆＃13;

var data = ["Abc", "Xyz,Hji,Lol", "Uyi,Mno"];
    result = data.map(s => s
        .split(',')
        .map(([c]) => c)
        .join());
    
console.log(result);

＆＃13;

Answer 2

您可以使用charAt方法返回字符串的第一个字符。

var newString = [];
for (var i=0; i< newString.length; i++)
{
    newString.push(ArrayString[i].charAt(0);
}

Answer 3

对阵列中的每个字符串使用 String.charAt（）方法，并将推送第一个字符添加到新数组中。

示例功能： -

function takeFirstChar(arr){ var new_arr = []; arr.forEach(function(el){ var firstLetter = el.charAt(0) new_arr.push(firstLetter); }); return new_arr; } takeFirstChar(['hello','cruel','world']); //Output-> ['h','c','w']

Answer 4

这是一个有效的例子：

＆＃13;

// We've got an array of comma separated worlds
// Sometimes we've got one, sometimes several
data=["Hello","i","have","one,array","and,i","store","comma,separated,string,in","the","array"];
// We want to ouput the same pattern but keeping the initial letter only
var result = [];
var items = [];
var aChar;
// We loop thru the data array
for (var i = 0; i < data.length; i++) { 
		// We make a small array with the content of each cell
        items = data[i].split(",");
		for (var j = 0; j < items.length; j++) { // We loop thru the items array
			aChar = items[j].charAt(0); // We take the first letter only
			if (aChar!="") // If the item/work was not empty the we keep only the initial letter in our items array
				items[j] = aChar;
		}
		result.push(items.join(",")); // we store comma separated first letters in our result array
    }

console.log(result)

＆＃13;

Answer 5

这看起来并不好看，也不容易理解。

＆＃13;

List

＆＃13;

如何从逗号分隔的字符串中取出第一个字母？

5 个答案: