Self-Taught Developer Journal, Day 29: TOP JavaScript Fundamentals Part 2 – Practice and Knowledge Check

This content originally appeared on DEV Community and was authored by Jennifer Tieu

Today I completed The Odin Project JS Fundamentals Part 2 Knowledge Check Section after reviewing all of the materials.

Knowledge Check

What are the eight data types in JavaScript? Numbers, BigInt, Strings, null, undefined, Boolean, Objects, Symbols
Which data type is NOT primitive? Objects
What is the relationship between null and undefined? The expression, null == undefined, returns true when using the loose equality operator, "==", but not for, "==="
What is the difference between single, double, and backtick quotes for strings? Single and double both behave the same. Backtick quotes can format strings with variables and expressions.
What is the term for embedding variables/expressions in a string? Template literals
Which type of quote lets you embed variables/expressions in a string? Backticks
How do you embed variables/expressions in a string? ${...}
How do you escape characters in a string? Put a blackslash, "\", in front of a character
What are methods? Actions performed on Objects
What is the difference between slice/substring/substr? Slice extracts a part of a string and returns the extracted part in a new string. Substring is similar to slice, but can't use negatives indices Substr is similar to slice, but the second parameter specifies the length of the extracted part.
What are the three logical operators and what do they stand for? && (AND), || (OR), ! (NOT)
What are the comparison operators? Operators that compare values between operands
What are truthy and falsy values? Values that return the boolean value true or false
What are the falsy values in JavaScript? 0, empty string, null, NaN, and undefined
What are conditionals? evaluates whether a statement/expression is true or false
What is the syntax for an if/else conditional? Refer to end
What is the syntax for a switch statement? Refer to end
What is the syntax for a ternary operator? condition ? value1: value2;
What is nesting? Putting a statement inside of another statement, therefore nesting them.

For Question 16:

if {
  ...
} else {
  ...
}

For Question 17:

switch (condition) {

  case a:

    code block

    break

  default:

    code block

}

Resources

The Odin Project Landing Page Project

This content originally appeared on DEV Community and was authored by Jennifer Tieu

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