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2 - Strings 1

The notes cover key concepts in JavaScript strings, including the use of .length as a property and .toLowerCase() as a method. It introduces the .at() method for character access and explains substring extraction using string.substring(). Additionally, it highlights template strings for interpolation, allowing variables to be included in strings using the ${variableName} syntax.

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19 views1 page

2 - Strings 1

The notes cover key concepts in JavaScript strings, including the use of .length as a property and .toLowerCase() as a method. It introduces the .at() method for character access and explains substring extraction using string.substring(). Additionally, it highlights template strings for interpolation, allowing variables to be included in strings using the ${variableName} syntax.

Uploaded by

jean_luc_worldwide
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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My notes https://learnjavascript.online/app.

html

Strings I
Note that .length should not have () after it because it is a property (a value that has already been computed).
Whereas .toLowerCase() is a method that requires the () because it's an action that you are performing

Since 2022, JavaScript now has a .at() method that reads the character at a certain index, which can also be
negative
const language = "JavaScript";
language.at(0); // "J"
language.at(1); // "a"
language.at(-1); // "t"
language.at(-2); // "p"

You can also combine the character access with the .length property. So using the same language variable,
here's how you get the second to last character from it:

const language = "JavaScript";

language[ language.length - 2 ]; // "p" because it's the second to last character from "JavaScript"

const language = "JavaScript";

language[ language.length - 2 ]; // "p" because it's the second to last character from "JavaScript"

A substring is a part or a portion of a string.


string.substring(indexStart, indexEnd) is used to return a portion of the string.
indexStart: the position of the first character you'd like to include.
indexEnd: the position of the first character you'd like to ignore.
the indexEnd argument is optional which means you can leave it out.
The + operator is used to add 2 numbers
The + operator is used to concatenate 2 strings

Note to self: Just a lil reminder, because it's always cool to remember =)

Interpolation

Template strings support interpolation! This means you could write a variable in your string, and get its
value. The syntax is straightforward, you wrap your variable name with a dollar sign and curly braces. Let's
take an example where we have a variable language with a value of JavaScript.

let language = "JavaScript";


`I am learning ${language}`; //"I am learning JavaScript";

A template string is a string created with the backtick character: `


Template strings can span multiple lines
Template strings support interpolation with the ${variableName} syntax
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1 de 1 5/6/2025, 8:10 AM

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