Core JavaScript variable declarations, data types, and operators explained with a short example each.
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38 basic cards for JavaScript JavaScript. Set 2 of 2 in JavaScript Basics. It opens with "What keyword declares a variable with block scope that cannot be reassigned?" and "What keyword declares a variable with block scope that can be reassigned?". More College and University decks are listed below.
38 cards · basic cards · AI-written, checked twice. Edit anything.
- What keyword declares a variable with block scope that cannot be reassigned?
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const- What keyword declares a variable with block scope that can be reassigned?
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let- What keyword declares a variable with function scope (pre-ES6)?
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var- What is the primitive data type for text?
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string- What is the primitive data type for whole and decimal numbers?
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number- What is the primitive data type with only two values: true or false?
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boolean- What is the primitive value that represents the absence of any value?
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null- What is the primitive value assigned to variables that have been declared but not initialized?
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undefined- What primitive data type represents a unique identifier that cannot be recreated?
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symbol- What primitive data type represents integers larger than Number.MAX_SAFE_INTEGER?
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bigint- What operator returns a string indicating the type of a value?
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typeof- What data structure is an ordered collection accessed by numeric index?
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array- What data structure is a collection of key-value pairs?
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object- What syntax allows embedding expressions inside a string using backticks?
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template literals- How do you join two strings together in JavaScript?
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Use the + operator or += assignment operator, or template literals with ${}
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