(args) Description. Earlier, when one wanted to assign a default value to a variable, a common pattern was to use the logical OR operator (||): However, due to || being a boolean logical operator, the left hand-side operand was coerced to a boolean for the evaluation and any falsy value (0, '', NaN, null, undefined) was not returned.
is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand.
JavaScript arguments are passed by value: The function only gets to know the values, not the argument's locations. Earlier, when one wanted to assign a default value to a variable, a common pattern was to use the logical OR operator (||): However, due to || being a boolean logical operator, the left hand-side operand was coerced to a boolean for the evaluation and any falsy value (0, '', NaN, null, undefined) was not returne…
© 2005-2020 Mozilla and individual contributors. which is useful to access a property of an object which may be null or undefined. The nullish coalescing operator (??) The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out, https://github.com/mdn/interactive-examples, https://github.com/mdn/browser-compat-data, Error: Permission denied to access property "x", RangeError: argument is not a valid code point, RangeError: repeat count must be less than infinity, RangeError: repeat count must be non-negative, ReferenceError: assignment to undeclared variable "x", ReferenceError: can't access lexical declaration`X' before initialization, ReferenceError: deprecated caller or arguments usage, ReferenceError: invalid assignment left-hand side, ReferenceError: reference to undefined property "x", SyntaxError: "0"-prefixed octal literals and octal escape seq.
Changes to arguments are not visible (reflected) outside the function. The parameters, in a function call, are the function's arguments. If a function changes an argument's value, it does not change the parameter's original value. JavaScript optional parameters allows Java developers to declare optional parameters. Content is available under these licenses. Use //# instead, SyntaxError: a declaration in the head of a for-of loop can't have an initializer, SyntaxError: applying the 'delete' operator to an unqualified name is deprecated, SyntaxError: for-in loop head declarations may not have initializers, SyntaxError: function statement requires a name, SyntaxError: identifier starts immediately after numeric literal, SyntaxError: invalid regular expression flag "x", SyntaxError: missing ) after argument list, SyntaxError: missing = in const declaration, SyntaxError: missing ] after element list, SyntaxError: missing name after .
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