Question

我有一个数组

var arr = ["abc=0","def=2","ghi=3","jkl=6","mno=9"];

现在我想检查数组中是否存在“ghi”和“mno”。如果那么价值是什么。

Answer 1

这是怎么做的：

＆＃13;

    var arr = ["abc=0","def=2","ghi=3","jkl=6","mno=9"];
    
    for(var child in arr){
        console.log(arr[child].includes("mno"));
    }

＆＃13;

编辑，对于旧浏览器，您可以这样做：

＆＃13;

var arr = ["abc=0","def=2","ghi=3","jkl=6","mno=9"];
    
    for(var child in arr){
        console.log(arr[child].search("mno"));
    }

＆＃13;

其中0等于真^^

Answer 2

var arr = ["abc=0","def=2","ghi=3","jkl=6","mno=9"];

function valueOf (array, key) {
  var value;
  if (array.find(function (item) {
    return ([ , value ] = item.split("="))[0] === key
  })) {
    return value;
  }
}

console.log(valueOf(arr, "ghi")); // 3
console.log(valueOf(arr, "mno")); // 9
console.log(valueOf(arr, "foo")); // undefined

Answer 3

使用lodash

var arr = ["abc=0","def=2","ghi=3","jkl=6","mno=9"];
var r = _.find(arr, function(i) { return i.includes('ghi'); });
alert(r);

DEMO

Answer 4

您可以使用Array.prototype.find()和String.prototype.includes()

arr.find(function(item) {
    if(typeof item === "string" && item.includes("asd")) {
        return true;
    }
    return false;
});

现在，如果找到了一个项目，你可以假设在数组中找到了该字符串。

Answer 5

循环遍历数组并检查每个字符串。

＆＃13;

sqlCopyTable(ch, 
         srctable = 'READ_ONLY.EXAMPLE',
         desttable = 'WORK.EXAMPLE')

Error in if (as.character(keys[[4L]]) == colnames[i]) create <- paste(create,  : 
  argument is of length zero

＆＃13;

function searchStringInArray (str, strArray) {
    for (var j=0; j<strArray.length; j++) {
        if (strArray[j].match(str)) return j;
    }
    return -1;
}

＆＃13;

Answer 6

最好和最简单的逻辑是：

arr.find(function(item) {
   return (typeof item === "string" && item.includes("ghi"));
});

如何检查字符串是否可用于数组

6 个答案: