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  1. SyntaxError: missing : after property id - Java...

    The JavaScript exception "missing : after property id" occurs when objects are created using the object initializer syntax. A colon (:) separates keys and values for the object's properties. Somehow, this colon is missing or misplaced.... js const obj = { propertyKey: "value"...this object initializer syntax. js const obj = { propertyKey = "value"...

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  2. TypeError: invalid assignment to const "x" - Ja...

    The JavaScript exception "invalid assignment to const" occurs when it was attempted to alter a constant value. JavaScript const declarations can't be re-assigned or redeclared.... js const COLUMNS = 80; // … COLUMNS...already taken in this scope. js const COLUMNS = 80; const WIDE_COLUMNS...

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  3. TypeError: "x" is not a constructor - JavaScrip...

    The JavaScript exception "is not a constructor" occurs when there was an attempt to use an object or a variable as a constructor, but that object or variable is not a constructor.... Examples Invalid cases js const Car = 1; new Car(); //...write the following function: js function Car(make, model, year)...

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  4. Arrow function expressions - JavaScript | MDN

    An arrow function expression is a compact alternative to a traditional function expression, with some semantic differences and deliberate limitations in usage:... Try it Syntax js () => expression param => expression...and always require parentheses: js (a, b, ...r) => expression (a...

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  5. TypeError: "x" is not a function - JavaScript |...

    The JavaScript exception "is not a function" occurs when there was an attempt to call a value from a function, but the value is not actually a function....is a typo in the method name: js const x = document.getElementByID("foo");...function name is getElementById : js const x = document.getElementById("foo");...

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  6. URL Pattern API - Web APIs | MDN

    The URL Pattern API defines a syntax that is used to create URL pattern matchers. These patterns can be matched against URLs or individual URL components. The URL Pattern API is used by the URLPattern interface....js . Fixed text and capture groups...but they can be overwritten. js // A pattern matching some fixed...

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  7. SyntaxError: invalid assignment left-hand side ...

    The JavaScript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. It may be triggered when a single = sign was used instead of == or ===....Examples Typical invalid assignments js if (Math.PI + 1 = 3 || Math.PI...plus ( + ) operator is needed. js if (Math.PI + 1 === 3 || Math...

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  8. SyntaxError: unparenthesized unary expression c...

    The JavaScript exception "unparenthesized unary expression can't appear on the left-hand side of '**'" occurs when a unary operator (one of typeof, void, delete, await, !, ~, +, -) is used on the left operand of the exponentiation operator without parentheses....likely wrote something like this: js -a ** b Whether it should be...side to resolve the ambiguity. js (-a) ** b -(a ** b) Other unary...

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  9. Labeled statement - JavaScript | MDN

    A labeled statement is any statement that is prefixed with an identifier. You can jump to this label using a break or continue statement nested within the labeled statement.... Try it Syntax js label: statement label Any JavaScript...labeled continue with for loops js // The first for statement is...

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  10. Logical AND assignment (&&=) - JavaScript | MDN

    The logical AND assignment (&&=) operator only evaluates the right operand and assigns to the left if the left operand is truthy.... Try it Syntax js x &&= y Description Logical AND...error, despite x being const : js const x = 0; x &&= 2; Neither...

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