Java determines whether an object is an array

Array is one of the important data structures for every programming language. Of course, different languages ​​have different implementation and processing of arrays. All the same.

Usage: (Recommended learning: java course)

Array.isArray(object)

Parameters

object: Content to be detected

Return value

The return value is of Boolean type.

If the object passed in is an array, return true, if not an array, return false.

Example:

Array.isArray([1, 2, 3, 4]);  // --> true
 
var obj = {
    a: 1,
    b: 2
};
Array.isArray(obj);  // --> false
 
Array.isArray(new Array);  // --> true
 
Array.isArray("Array");  // --> false

Note: Array.isArray was launched in ES 5.1 and does not support IE6~8, so you should also pay attention to compatibility when using it question.

The processing method is as follows:

if(typeof Array.isArray != "function") {
    Array.isArray = function(obj){
        return Object.prototype.toString.call(obj) == "[object Array]";
    }
}

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