Javascript Terms

Front 1

Hoisting

Back 1

Within its current scope, regardless of where a variable is declared, it will be, behind the scenes, hoisted to the top.

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Expression

Back 2

A phrase of JavaScript that can be evaluated to produce a value

Front 3

Statement

Back 3

A JavaScript command, terminated with a semicolon that are executed to make something happen.

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Initializer Expression

Back 4

The syntax for listing array elements within square braces or mapping object property names to property values inside curly braces.

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Lexical Structure

Back 5

Set of elementary rules that specifies how you write programs in a programming language.

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Function

Back 6

A named and parametrized block of JavaScript code that you define once, and can then invoke over and over again

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Method

Back 7

A function defined in an object.

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Control Structure

Back 8

Statements that are conditionals or loops.

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Literal

Back 9

A data value that appears directly in a program.

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Identifier

Back 10

A name used to name variables and functions and to provide labels for certain loops in JavaScript code.

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Primitive types

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Numbers, strings of text, Boolean truth values, null and undefined

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Object types

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Arrays, functions and global objects

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Constructors

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Functions that are written to be used (with the new operator) to initialize a newly created object.

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Object class

Back 14

A set of objects initialized by the constructor.

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Mutable type

Back 15

Any JavaScript type that can be changed, like objects and arrays.

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Immutable Type

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Any JavaScript type that cannot be changed, like numbers, booleans, null, undefined, and strings (yes, strings!)

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Lexical scope

Back 17

Scope of variables that are declared outside of a function, are global variables and are visible everywhere in a JavaScript program.

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Function scope

Back 18

Variables declared inside a function have function scope and are visible only to code that appears inside that function.

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Numeric literal

Back 19

A number that appears directly in a JavaScript program.

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Global object

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Globally defined symbols that are available to a JavaScript program like undefined, Infinity, NaN, isNaN(), parseInt(), eval(), Date(), RegExp(), String(), Object(), Array(), Math and JSON

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Null

Back 21

A JavaScript language keyword that is an object that represents the absence of a value.

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Undefined

Back 22

A predefined global variable that is the value of a variable or object that has not been initialized, or of a function that returns no value.

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Calling Statement

Back 23

a statement that gransfers program execution to a subroutine, procedure or function. When the subroutine is complete, execution transfers back to the command following the call statement.