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JavaScript: String Operators

String Concatenation

When working with JavaScript strings sometimes you need to join two or more strings together into a single string. Joining multiple strings together is known as concatenation.

The concatenation operator

The concatenation operator (+) concatenates two or more string values together and return another string which is the union of the two operand strings.

The shorthand assignment operator += can also be used to concatenate strings.

Example:

The following web document demonstrates the use of concatenation operator (+) and shorthand assignment operator +=.

HTML Code

<!doctype html>
<head>
<meta charset="utf-8">
<title>JavaScript string operator example.</title>
<meta name="description" content="This document contains an example of JavaScript string operator"/>
</head>
<body>
<script src="javascript-string-operator-example1.js"></script>
</body>
</html>

JS Code

var newParagraph = document.createElement("p"); 
var newText = document.createTextNode("'google' + '.' + ' com=" + 'google' + '.' + ' com');
newParagraph.appendChild(newText); 
document.body.appendChild(newParagraph); 

var string1= 'google';
var newParagraph1 = document.createElement("p"); 
var newText1 = document.createTextNode('string1='+string1);
newParagraph1.appendChild(newText1);
document.body.appendChild(newParagraph1);

string1 +='.com';
var newParagraph1 = document.createElement("p"); 
var newText1 = document.createTextNode('string1='+string1);
newParagraph1.appendChild(newText1);
document.body.appendChild(newParagraph1);

View the example in the browser

Practice the example above online

See the Pen string-operator-1 by w3resource (@w3resource) on CodePen.


Previous: JavaScript: Logical Operators - AND, OR, NOT
Next: JavaScript: Conditional Operator

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04