Challenges

Challenges

• ProgrammingMultiple choice

  Primitive values

  Tell simple values apart from arrays and objects.

  Beginner2 minValues and types
• ProgrammingMultiple choice

  The type of a number

  Find out what typeof reports for a whole number.

  Beginner1 minValues and types
• ProgrammingPredict the output

  Three typeof results

  Predict what typeof reports for three different values.

  Beginner2 minValues and types
• ProgrammingFill in the blank

  Clean up and shout

  Complete two string methods so the text is trimmed and upper-case.

  Beginner3 minStrings
• ProgrammingNumeric answer

  Counting characters

  Work out the length of a string.

  Beginner1 minStrings
• ProgrammingWrite code

  Shout it

  Return a string in capital letters with an exclamation mark.

  Beginner4 minStrings, Functions
• ProgrammingWrite code

  Your first message

  Print two lines with console.log.

  Beginner3 minStrings, Values and types
• ProgrammingMultiple choice

  Adding decimals

  Predict a comparison that surprises many beginners.

  Intermediate2 minNumbers, Boolean expressions
• ProgrammingMultiple choice

  Changing a constant

  Predict what happens when you assign to a const.

  Beginner2 minVariables and scope
• ProgrammingWrite code

  Greet a guest

  Use a variable inside a printed message.

  Beginner4 minVariables and scope, Strings
• ProgrammingPredict the output

  Updating a score

  Follow a variable as it changes line by line.

  Beginner2 minVariables and scope, Operators
• ProgrammingNumeric answer

  Order of operations

  Work out which part of an expression runs first.

  Beginner1 minOperators
• ProgrammingPredict the output

  Text meets number

  See how + and - treat a string and a number.

  Beginner2 minOperators, Strings
• ProgrammingNumeric answer

  What is left over

  Use the % operator to find a remainder.

  Beginner1 minOperators, Numbers
• ProgrammingPredict the output

  Double or triple equals

  Compare == and === on the same values.

  Intermediate3 minBoolean expressions, Operators
• ProgrammingMultiple choice

  Falsy values

  Which values does if treat as false?

  Intermediate3 minBoolean expressions, Control flow
• ProgrammingPut in order

  Build a discount

  Put four lines in the order that makes the program work.

  Beginner3 minControl flow, Variables and scope
• ProgrammingPredict the output

  The first matching branch

  Follow an if / else if / else chain.

  Beginner2 minControl flow
• ProgrammingWrite code

  Ticket price

  Choose a price with if and else, and get the boundaries right.

  Beginner6 minControl flow, Functions
• ProgrammingWrite code

  Add two numbers

  Write a function that returns a sum.

  Beginner4 minFunctions, Numbers
• ProgrammingWrite code

  Convert a temperature

  Turn a formula into a function.

  Beginner5 minFunctions, Operators
• ProgrammingDebug

  Fix the average

  A calculation that runs but gives the wrong answer.

  Beginner5 minDebugging, Operators
• ProgrammingDebug

  Fix the syntax error

  A program that never starts: find the missing piece.

  Beginner4 minDebugging, Functions
• ProgrammingDebug

  Fix the weekend check

  A condition that can never be true.

  Beginner5 minDebugging, Boolean expressions