JavaScript from zero

Install Node.js and VS Code, and run your first program on your own machine.

• Install Node.js and VS Code 10 min

Print text and numbers, read errors, and leave notes in your code.

• Hello, World! 5 min
• Printing text and numbers 8 min
• Errors and comments 8 min

Store numbers, text and true/false values, and change them.

• Boxes with names 8 min
• Types of values 8 min
• Changing values 7 min

Read numbers and words that are fed into your program.

• Reading input 9 min
• Several values 8 min
• Whole lines 7 min

Do maths, compare values, and avoid the classic traps.

• Maths with numbers 9 min
• Comparing values 6 min
• Decimals and rounding 6 min

Make your program choose what to do.

• Making a choice 8 min
• More than two choices 8 min
• Combining conditions 8 min

Repeat code without copying it: for and while.

• The for loop 9 min
• The while loop 8 min
• Reading many numbers 9 min

A loop inside a loop: grids, tables and star patterns.

• Loops inside loops 9 min
• Patterns 10 min

Name a piece of code, give it inputs, and reuse it.

• Your own functions 9 min
• What a function can change 8 min
• Yes/no functions 9 min

Store many values under one name and reach any of them by position.

• Arrays 10 min
• Array tools 9 min
• Working with positions 9 min

Work with text one character at a time.

• Characters in a string 9 min
• String tools 9 min
• Two ends of a string 9 min

Grids and tables: arrays of arrays.

• Grids 9 min
• Moving around a grid 9 min

Look things up by key, count things, and keep only unique values.

• Maps: look up by key 9 min
• Sets: unique values 7 min

Functions that call themselves on a smaller problem.

• A function that calls itself 9 min
• Thinking recursively 10 min

Your own types, sorting by your own rules, and the nodes behind linked lists.

• Your own types 9 min
• Sorting 10 min
• Nodes and linked lists 10 min

Count the steps your code takes, and get ready for LeetCode.

• Counting steps 10 min
• Ready for LeetCode 8 min