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)
HelloWorldConcatenating 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!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)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.