Describe the semantics of the join method of Array.
时间: 2023-11-22 18:56:43 浏览: 93
vhdl.rar_The Power of Logic_des_gates_microprocessor_microproces
The `join()` method is a built-in method of the `Array` object in JavaScript that is used to join all the elements of an array into a single string. This method takes an optional separator argument that specifies the delimiter to be used between each array element when creating the resulting string.
If no separator is provided, the default separator is `,` (comma). The `join()` method does not modify the original array, but returns a new string that contains all the elements of the array joined together.
For example, suppose we have the following array:
```javascript
let fruits = ['apple', 'banana', 'orange'];
```
We can use the `join()` method to join the elements of the array into a string with a comma separator like this:
```javascript
let fruitString = fruits.join();
console.log(fruitString); // "apple,banana,orange"
```
Alternatively, we can specify a different separator, such as a dash, using the `join()` method like this:
```javascript
let fruitString = fruits.join('-');
console.log(fruitString); // "apple-banana-orange"
```
In summary, the `join()` method of the `Array` object in JavaScript is used to join all the elements of an array into a single string, with an optional separator argument that specifies the delimiter to be used between each array element.
阅读全文