This content originally appeared on DEV Community and was authored by DevCronin
In this blog series tutorial, I will be covering some of the basic JavaScript programming concepts.
This is geared toward beginners and anyone looking to refresh their knowledge.
Level 5 will cover:
- Concatenating Strings with Plus Equals Operator
- Constructing Strings with Variables
- Appending Variables to Strings
- Find the Length of a String
- Use Bracket Notation to Find the First Character in a String
Concatenating Strings with Plus Equals Operator
As we did with the compounded assignment (+=) operator before, now we will use it to concatenate a string on an existing variable.
Remember, spaces only exist if we add them.
let iroh = "dragon, ";
iroh += "of the west.";
console.log(iroh);
"dragon, of the west"
Constructing Strings with Variables
In JavaScript, it is common to build longer, more complex strings.
To do this we will be using the concatenation operator (+) to insert one or more variables to construct the string.
let mySpell = "magic missile";
let spellDescription = "I cast " + mySpell + ", and three glowing darts home in on my target.";
console.log(spellDescription)
"I cast magic missile, and three glowing darts home in on my target."
Appending Variables to Strings
Variables can also be appended to strings using the (+=) operator.
let alignment = "Chaotic ";
let alignmentTwo = "Good";
alignment += alignmentTwo;
console.log(alignment);
Chaotic Good
Find the Length of a String
To find the length of a string we use ".length" after the string but before the end (;).
Length is given in the number of characters start with the index of zero.
It can also be used on string variables or string literals.
let game = "Dungeons and Dragons";
let gameLength = game.length;
console.log(gameLength);
20
Use Bracket Notation to Find the First Character in a String
In JavaScript counting starts at 0, and is referred to as Zero-based indexing.
By using bracket notation ([]) we can get any character at a specific index in a string.
let character = "Wizard";
let firstLetter = character[0];
console.log(firstLetter);
"W"
Thank you for reading my blog! This is the Fifth of my series on JavaScript so if you would like to read more, please follow!
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This content originally appeared on DEV Community and was authored by DevCronin
DevCronin | Sciencx (2021-09-04T17:54:57+00:00) LEVEL UP with JavaScript! LVL 5. Retrieved from https://www.scien.cx/2021/09/04/level-up-with-javascript-lvl-5/
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