- boolean - null - undefined - number - bigint - string - symbol - objects (collection of properties) a falsy value is a value that is considered false when encountered in abooleancontext. false the keyword false 0 the number zero -0 the number negative zero 0n the bigint zero null null – the absence of any value undefined undefined – the primitive value nan nan – not a number type coercion is the automatic or implicit conversion of values from one data type to another (such as strings to numbers).type conversionis similar to type coercion because they both convert values from one data type to another with one key difference — type coercion is implicit whereas type conversion can be either implicit or explicit. example: const value1 = '1';const value2 = 2;let sum = value1 + value2;console.log(sum); - var – declares a variable, optionally initializing it to a value. - let – declares a block scope local variable, optionally initializing it to a value. - const – declares a read-only named constant. - do...while – creates a loop that executes a specified statement until the test condition evaluates to false. the condition is evaluated after executing the statement, resulting in the specified statement executing at least once. - for – creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop. - for...in – iterates over the enumerable properties of an object, in arbitrary order. for each distinct property, statements can be executed. - for...of ...
- boolean - null - undefined - number - bigint - string - symbol - objects (collection of properties) afalsy value is a value that is considered false when encountered in abooleancontext. false the keyword false 0 the number zero -0 the number negative zero 0n the bigint zero null null – the absence of any value undefined undefined – the primitive value nan nan – not a number type coercion is the automatic or implicit conversion of values from one data type to another (such as strings to numbers).type conversionis similar totype coercionbecause they both convert values from one data type to another with one key difference —type coercionis implicit whereastype conversioncan be either implicitorexplicit. example: const value1 = '1';const value2 = 2;let sum = value1 + value2;console.log(sum); - var – declares a variable, optionally initializing it to a value. - let – declares a block scope local variable, optionally initializing it to a value. - const – declares a read-only named constant. - `do...while` – creates a loop that executes a specified statement until the test condition evaluates to false. the condition is evaluated after executing the statement, resulting in the specified statement executing at least once. - `for` – creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop. - `for...in` – iterates over the enumerable properties of an object, in arbitrary order. for each distinct property, statements can be executed. - `for...of` – iterates over iterable o...
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