- Tags: JS Operator, String
- Categories: JavaScript Operators, JavaScript Reference, Reference
Quick Reference
In JavaScript, the + operator, and the += operator can be used to concatenate (bring together) multiple strings, or strings and variables.
<!-- html element to place output -->
<p id="my_output"></p>
Concatenating Two Strings
Example 1
// variables
let text_1 = 'Hello';
let text_2 = 'World';
let my_text = text_1 + text_2; // creates a new variable with the combined string
// output to HTML element
document.getElementById('my_output').innerHTML = my_text;
Example 2
// variables
let text_1 = 'Hello';
let text_2 = 'World';
text_1 += text_2; // adds the second string directly to the first string
// output to HTML element
document.getElementById('my_output').innerHTML = text_1;
Output (both example 1 and 2)
HelloWorld
Concatenating Two Strings and HTML
// variables
// variables
let text_1 = 'Hello...';
let text_2 = 'World!';
let my_text = text_1 + ' ' + text_2; // spaces between strings
// output to HTML element
document.getElementById('my_output').innerHTML = my_text;
Output
Hello... World!
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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