Data Types and Type Conversion Quiz

Study Notes

Mathematical Operations and Expressions

The operation 2 + 4 * 5 / 9 evaluates to approximately 4.8 after following the order of operations (multiplication and division before addition).
The expression '33abc' converted to a Number results in NaN (Not a Number) because it contains non-numeric characters.
The expression 1 + '2' results in '12' due to type coercion, where the number is converted to a string and concatenated.
The expression '2' + 2 + 2 results in '222', following the same type coercion process where numbers are treated as strings.
The expression 100++ is interpreted as an attempt to increment a numeric value and does not return a valid result; it will throw an error as it's not a valid operation.

Data Types in JavaScript

The Symbol data type in JavaScript is a primitive data type used to create unique identifiers for object properties.
A non-primitive data type example is an object or an array, which can hold collections or more complex entities.

Variable Assignment Behavior

When a variable declared using a primitive data type (like number, string, or boolean) is assigned to another variable, it creates a copy of the value. Changes to the new variable do not affect the original.
Reassignment in primitive data types results in the new variable maintaining its own copy of the value.

Description

Test your knowledge of data types such as null, undefined, and symbol, as well as type conversion in JavaScript. Learn about the differences between null, undefined, and symbol, and explore how to convert values to numbers, booleans, and strings.