jquery array remove string

During the front-end development process, we often encounter situations where we need to process arrays. If the array contains strings, it may cause some difficulties for us to operate. Therefore, it is necessary to understand how to remove strings from an array using jQuery.

First, let’s look at an example of an array containing strings:

var arr = ["apple", "banana", "cherry", "dog", "egg"];

Suppose we want to remove all the strings in this array, we can use jQuery’s grep() method ：

var newArr = $.grep(arr, function(item) {
  return typeof item !== "string";
});

In this example, we use jQuery's grep() method, which can filter out elements that meet the conditions by traversing the array and return a new array. Among them, the first parameter is the array that needs to be filtered, and the second parameter is a callback function used to determine which elements should be retained in the new array. The item parameter in the callback function is the currently traversed element.

In our example, we use the typeof operator to determine whether the currently traversed element is a string. If not, it will be retained in the new array and eventually the new array will be returned.

Let’s take a look at the output of this example:

["dog", "egg"]

As you can see, we have successfully removed the strings in the array.

In addition, we can also use a simple for loop to achieve this operation:

var newArr = [];

for (var i = 0; i < arr.length; i++) {
  if (typeof arr[i] !== "string") {
    newArr.push(arr[i]);
  }
}

In this example, we initialize a new array newArr, and then use a for loop to traverse the original array , if the current element is not a string, add it to the new array.

The final output result is also consistent with that obtained using the grep() method.

However, it should be noted that using a for loop may cause performance degradation when the array length is long, so it is recommended to give priority to using jQuery's grep() method in actual development.

To summarize, using jQuery to remove strings from an array is a very common requirement. In actual development, there are many ways to implement it, including using jQuery's grep() method and using a for loop. Either way, the type of each element in the array needs to be judged, and finally the elements that meet the conditions are added to a new array. Especially when dealing with large-scale data, you need to pay attention to performance issues.

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