Knowledge Check · Easy · 1 min
Where is a var declared inside a function available
Where is a var declared inside a function available?
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Technical interview practice tasks
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Page 79 of 386 · 18,491 tasks
Knowledge Check · Easy · 1 min
What is a closure
What is a closure?
View taskKnowledge Check · Easy · 1 min
What happens when code assigns a new value to a const binding
What happens when code assigns a new value to a const binding?
View taskKnowledge Check · Hard · 1 min
Which statements about JavaScript closures are correct
Which statements about JavaScript closures are correct?
View taskKnowledge Check · Hard · 1 min
Which approaches give each loop callback its own iteration value
Which approaches give each loop callback its own iteration value?
View taskKnowledge Check · Hard · 1 min
What happens when code reads a let binding before its declaration is evaluated
What happens when code reads a let binding before its declaration is evaluated?
View taskKnowledge Check · Hard · 1 min
Why do two calls to the same counter factory keep independent counts
Why do two calls to the same counter factory keep independent counts?
View taskKnowledge Check · Medium · 1 min
Where does a function resolve an unqualified variable name
Where does a function resolve an unqualified variable name?
View taskKnowledge Check · Medium · 1 min
What can code change after assigning an object to a const binding
What can code change after assigning an object to a const binding?
View taskKnowledge Check · Medium · 1 min
What happens when an inner block declares a name already used in an outer scope
What happens when an inner block declares a name already used in an outer scope?
View taskKnowledge Check · Medium · 1 min
A closure reads an outer let value after that value changes. What does it see
A closure reads an outer let value after that value changes. What does it see?
View taskKnowledge Check · Easy · 1 min
Which primitive represents a value that has not been assigned
Which primitive represents a value that has not been assigned?
View taskKnowledge Check · Easy · 1 min
Which operator compares values without type coercion
Which operator compares values without type coercion?
View taskKnowledge Check · Easy · 1 min
Which function checks whether a value is the Number value NaN without coercion
Which function checks whether a value is the Number value NaN without coercion?
View taskKnowledge Check · Easy · 1 min
Can JavaScript string values be changed in place
Can JavaScript string values be changed in place?
View taskKnowledge Check · Hard · 1 min
Which values become false when converted to Boolean
Which values become false when converted to Boolean?
View taskKnowledge Check · Hard · 1 min
Which statements about Object.is are correct
Which statements about Object.is are correct?
View taskKnowledge Check · Hard · 1 min
What is the result of an empty array compared loosely with false
What is the result of an empty array compared loosely with false?
View taskKnowledge Check · Hard · 1 min
Which value is loosely equal to null without being null
Which value is loosely equal to null without being null?
View taskKnowledge Check · Medium · 1 min
What does strict equality do when operand types differ
What does strict equality do when operand types differ?
View taskKnowledge Check · Medium · 1 min
What does Number applied to an empty string return
What does Number applied to an empty string return?
View taskKnowledge Check · Medium · 1 min
What does Boolean applied to the string "0" return
What does Boolean applied to the string "0" return?
View taskKnowledge Check · Medium · 1 min
What does typeof null return
What does typeof null return?
View taskKnowledge Check · Easy · 1 min
Which symbol commonly names a generic type parameter
Which symbol commonly names a generic type parameter?
View taskKnowledge Check · Easy · 1 min
Which syntax explicitly exports User only as a type
Which syntax explicitly exports User only as a type?
View taskKnowledge Check · Easy · 1 min
Which syntax imports the named export User
Which syntax imports the named export User?
View taskKnowledge Check · Easy · 1 min
What is the main purpose of a generic type parameter
What is the main purpose of a generic type parameter?
View taskKnowledge Check · Hard · 1 min
Which generic constraints let a function safely read a length property
Which generic constraints let a function safely read a length property?
View taskKnowledge Check · Hard · 1 min
Which statements about import type are correct
Which statements about import type are correct?
View taskKnowledge Check · Hard · 1 min
When does a conditional type distribute over union members
When does a conditional type distribute over union members?
View taskKnowledge Check · Hard · 1 min
Which key constraint makes get(obj, key) return only an existing property type
Which key constraint makes get(obj, key) return only an existing property type?
View taskKnowledge Check · Medium · 1 min
Why does a generic identity function preserve more type information than one using any
Why does a generic identity function preserve more type information than one using any?
View taskKnowledge Check · Medium · 1 min
What does keyof produce for an object type with id and name properties
What does keyof produce for an object type with id and name properties?
View taskKnowledge Check · Medium · 1 min
What does extends mean in a generic type-parameter constraint
What does extends mean in a generic type-parameter constraint?
View taskKnowledge Check · Medium · 1 min
What does a default generic type parameter provide
What does a default generic type parameter provide?
View taskKnowledge Check · Easy · 1 min
Which syntax declares a value that may be a string or number
Which syntax declares a value that may be a string or number?
View taskKnowledge Check · Easy · 1 min
Which type is safer than any for a value whose shape is not yet known
Which type is safer than any for a value whose shape is not yet known?
View taskKnowledge Check · Easy · 1 min
Which TypeScript type represents a value that should never occur
Which TypeScript type represents a value that should never occur?
View taskKnowledge Check · Easy · 1 min
Which property declaration allows name to be absent
Which property declaration allows name to be absent?
View taskKnowledge Check · Hard · 1 min
Which choices make a TypeScript union reliably discriminated
Which choices make a TypeScript union reliably discriminated?
View taskKnowledge Check · Hard · 1 min
Which statements about unknown are correct
Which statements about unknown are correct?
View taskKnowledge Check · Hard · 1 min
Which type should remain in an exhaustive switch default after every union member is handled
Which type should remain in an exhaustive switch default after every union member is handled?
View taskKnowledge Check · Hard · 1 min
Which return annotation declares that a function narrows value to Fish when it returns true
Which return annotation declares that a function narrows value to Fish when it returns true?
View taskKnowledge Check · Medium · 1 min
Which check narrows value from string or number to string
Which check narrows value from string or number to string?
View taskKnowledge Check · Medium · 1 min
Which operator can narrow a union by checking whether a property exists
Which operator can narrow a union by checking whether a property exists?
View taskKnowledge Check · Medium · 1 min
If a string-or-number value strictly equals a string value, how is it narrowed in that branch
If a string-or-number value strictly equals a string value, how is it narrowed in that branch?
View taskKnowledge Check · Medium · 1 min
Why can if (value) be unsafe for a string or null value when an empty string is valid
Why can if (value) be unsafe for a string or null value when an empty string is valid?
View taskKnowledge Check · Easy · 1 min
What is the main purpose of Signal in Angular change detection signals
What is the main purpose of Signal in Angular change detection signals?
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