Use jQuery/JavaScript to implode arrays
In this tutorial, we will learn to merge the given arrays using JavaScript and JQuery. In web development, there are often situations where arrays need to be merged. For example, we are given a list of tags and need to merge them into a string to insert into the web page. Another situation where you may need to merge arrays is when writing SQL queries.
Here we will learn 4 ways to concatenate the elements of a given array.
Use the Array.join() method to merge arrays
The array.join() method allows us to join array elements into a string by specifying the delimiter.
grammar
Users can use the JavaScript join() method to merge arrays according to the following syntax.
Array.join(delimiter)
In the above syntax, 'Array' is the reference array to be merged, and the delimiter is the character we need to use to join the array elements.
Example
We have created an ‘arr’ array containing fruit names in the example below. After that, we use the array.join() method to concatenate all the fruit names and store them in the ‘fruits’ string.
In the output, we can observe the 'fruits' string containing the names of all the fruits in the array.
<html>
<body>
<h3 id="Using-the-i-array-join-i-method-to-implode-the-array-in-JavaScript"> Using the <i> array.join() </i> method to implode the array in JavaScript </h3>
<div id="output"> </div>
<script>
let output = document.getElementById('output');
// Array of fruit names
let arr = ["Banana", "Orange", "Apple", "Mango"];
// Join the array elements
let fruits = arr.join();
output.innerHTML = "The original array is: " + arr + "<br><br>";
output.innerHTML += "The joined array is: " + fruits;
</script>
</body>
</html>
Example
We created an array containing color names in the example below. After that, we used join() method and passed ‘|’ character as parameter of join() method to separate each array element with delimiter.
In the output, the user can observe the original array elements and the merged array result.
<html>
<body>
<h3 id="Using-the-i-array-join-i-method-to-implode-the-array-in-JavaScript"> Using the <i> array.join() </i> method to implode the array in JavaScript </h3>
<div id="output"> </div>
<script>
let output = document.getElementById('output');
let colors = ["Red", "Green", "White", "Black"];
// Join the array elements
let colorStr = colors.join(' | ');
output.innerHTML = "The original array is: " + colors + "<br><br>";
output.innerHTML += "The joined array is: " + colorStr;
</script>
</body>
</html>
Combining arrays in JavaScript using a for loop and the ‘ ’ operator
We can use a for loop or while loop to traverse the array. While iterating over the array elements, we can connect them using the ' ' or ' = ' operator. Additionally, we can use delimiters while concatenating array elements.
grammar
Users can use the for loop and ' ' operator to combine arrays according to the following syntax.
for ( ) {
result += array[i];
}
In the above syntax, we append arry[i] to the 'result' string.
Example
In the example below, we create an array containing numbers in ascending order. We create a variable called 'numberStr' to store the concatenated array result.
We use a for loop to iterate through the array and append number[i] to 'numberStr' on each iteration. Additionally, we add the '<' delimiter after appending each element to the 'numberStr' string.
In the output, we can observe that we prepare the string containing '<' by concatenating the array elements.
<html>
<body>
<h3 id="Using-the-i-for-loop-and-operator-i-to-implode-the-array-in-JavaScript">Using the <i> for loop and + operator </i> to implode the array in JavaScript</h3>
<div id="output"> </div>
<script>
let output = document.getElementById('output');
let number = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100];
let numberStr = "";
// Using the for loop
for (let i = 0; i < number.length; i++) {
numberStr += number[i];
if (i < number.length - 1) {
numberStr += " < ";
}
}
output.innerHTML = "The original array is: " + number + "<br><br>";
output.innerHTML += "The joined array is: " + numberStr;
</script>
</body>
</html>
Use the Array.reduce() method and the ‘ ’ operator to merge arrays in JavaScript
The array.reduce() method works by merging array lists into a single element. Here, we will execute the array.reduce() method by taking the array as reference and passing the callback function as parameter to concatenate the array elements.
grammar
Users can use the array.reduce() method to merge arrays according to the following syntax.
message.reduce((a, b) => a + " " + b);
In the above syntax, we pass the callback function to the join method to join the array elements.
Example
In the example below, we create an array containing message strings. After that, we take the 'message' array as a reference and execute the reduce() method to merge the arrays.
In addition, we pass the a and b parameters to the callback function of the reduce() method. After each iteration, 'a' stores the merged result of the array, while 'b' represents the current array element. The function body appends 'b' to 'a' in a space-separated manner.
Using the array.reduce() method to implode the array in JavaScript
<script> let output = document.getElementById('output'); let message = ["Hello", "Programmer", "Welcome", "to", "JavaScript", "Tutorial"]; // Using the array.reduce() method let messageStr = message.reduce((a, b) => a + " " + b); output.innerHTML = "The original array is: " + message + "<br><br>"; output.innerHTML += "The joined array is: " + messageStr; </script>
Use Each() method to merge arrays in JQuery
Each jQuery's () method is used to iterate over array elements. We can iterate over the array elements and concatenate each element one by one.
grammar
Users can use JQuery's each() method to merge arrays according to the following syntax.
$.each(array, function (index, value) {
treeStr += value + " ";
});
In the above syntax, the each() method implode the array as the first parameter and connects the callback function to the array as the second parameter.
Example
In the example below, we create an array containing tree names. After that, we iterate over the array using jQuery's each() method. We get the current index and element value in the callback function of each() method. So we append the element value into 'treeStr'.
Finally, we can observe the value of ‘treeStr’ in the output.
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
</head>
<body>
<h3 id="Using-the-i-each-method-i-to-implode-the-array-in-jQuery">Using the <i> each() method </i> to implode the array in jQuery</h3>
<div id="output"> </div>
<script>
let output = document.getElementById('output');
let tree = ["oak", "pine", "ash", "maple", "walnut", "birch"];
let treeStr = "";
// Using the each() method
$.each(tree, function (index, value) {
treeStr += value + " ";
});
output.innerHTML = "The original array is: " + tree + "<br><br>";
output.innerHTML += "The joined array is: " + treeStr;
</script>
</body>
</html>
The array.join() method is one of the best ways to combine arrays in JavaScript. However, if programmers need more custom options for merging arrays, they can also use for loops and the ' ' operator. In JQuery, programmers can use each() method or makeArray() and join() methods, which work similar to JavaScript's join() method.
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