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Is there a way in javascript to find out how many times a certain string is in an array?

开发者 https://www.devze.com 2023-01-22 19:12 出处:网络
I have an array that I want to find the number of string \'hello\'开发者_运维问答 in it. Is there any way to do this? var count = 0;

I have an array that I want to find the number of string 'hello'开发者_运维问答 in it. Is there any way to do this?


var count = 0;
for(var i=0; i<myArray.length; i++) {
    if(myArray[i] == 'hello') {
        count++;
    }
}


Assuming it's an array of strings,

var count = 0;
for (var i = 0; i < stringArray.length; ++i) {
  if (stringArray[i] == "hello")
    ++count;
}


And now for something completely different functional:

var count = stringArray.filter(function(x) { return x == "hello" }).length


var arr=['no','hello',2,true,false,'hello','true','hello'];
if(arr.indexOf){
    var ax= -1, count= 0;
    while((ax= arr.indexOf('hello', ax+1))!= -1)++count;
}
alert(count)


Or

var count = stringArray.reduce(function(a,b){ return (b=='hello')?a+1:a},0)
0

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