Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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[画像:### JavaScript Array Methods: pop() #### pop() The `pop()` method removes the last element from an array. The return value of the `pop()` method is the removed item. ```html <!DOCTYPE html> <html> <head> </head> <body> <h2>JavaScript Array Methods</h2> <h2>pop()</h2> <p>The pop() method removes the last element from an array.</p> <p>The return value of the pop() method is the removed item.</p> <p id="demo1"></p> <p id="demo2"></p> <p id="demo3"></p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo1").innerHTML = fruits; document.getElementById("demo2").innerHTML = fruits.pop(); document.getElementById("demo3").innerHTML = fruits.shift(); </script> </body> </html> ``` #### Explanation The above code demonstrates the use of the JavaScript `pop()` method, which is used to remove the last element from an array. Here's the breakdown: 1. An array `fruits` is defined with the elements `["Banana", "Orange", "Apple", "Mango"]`. 2. The content of this array is displayed in a paragraph element with the id `demo1`. 3. The `.pop()` method is called on the `fruits` array, removing the last element (`"Mango"`) and returning its value to be displayed in a paragraph element with the id `demo2`. 4. The `.shift()` method is also called on the `fruits` array, removing the first element (`"Banana"`) and returning its value to be displayed in a paragraph element with the id `demo3`. **Expected Output:** - **demo1:** `Banana,Orange,Apple` (After removal of "Mango") - **demo2:** `Mango` (The element removed by `pop()`) - **demo3:** `Banana` (The element removed by `shift()`)]
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Transcribed Image Text:### JavaScript Array Methods: pop() #### pop() The `pop()` method removes the last element from an array. The return value of the `pop()` method is the removed item. ```html <!DOCTYPE html> <html> <head> </head> <body> <h2>JavaScript Array Methods</h2> <h2>pop()</h2> <p>The pop() method removes the last element from an array.</p> <p>The return value of the pop() method is the removed item.</p> <p id="demo1"></p> <p id="demo2"></p> <p id="demo3"></p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo1").innerHTML = fruits; document.getElementById("demo2").innerHTML = fruits.pop(); document.getElementById("demo3").innerHTML = fruits.shift(); </script> </body> </html> ``` #### Explanation The above code demonstrates the use of the JavaScript `pop()` method, which is used to remove the last element from an array. Here's the breakdown: 1. An array `fruits` is defined with the elements `["Banana", "Orange", "Apple", "Mango"]`. 2. The content of this array is displayed in a paragraph element with the id `demo1`. 3. The `.pop()` method is called on the `fruits` array, removing the last element (`"Mango"`) and returning its value to be displayed in a paragraph element with the id `demo2`. 4. The `.shift()` method is also called on the `fruits` array, removing the first element (`"Banana"`) and returning its value to be displayed in a paragraph element with the id `demo3`. **Expected Output:** - **demo1:** `Banana,Orange,Apple` (After removal of "Mango") - **demo2:** `Mango` (The element removed by `pop()`) - **demo3:** `Banana` (The element removed by `shift()`)
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