Data Types and Type Conversion Quiz

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.