Set default value with logical or operator in javascript

in javascript, the logical or operator (`||`) can be utilized to set default values for variables. when evaluating expressions, this operator returns the first truthy value it encounters. if the left operand evaluates to a falsy value (such as `undefined`, `null`, `0`, `false`, `nan`, or an empty string), the expression will return the right operand. this behavior allows developers to assign default values succinctly. by leveraging this feature, one can ensure that variables have valid values even when they are not explicitly provided. this is particularly useful in functions where parameters may be optional. using the logical or operator in this way enhances code readability and reduces the need for verbose conditional checks, making it a popular pattern in javascript development. it's a convenient method to streamline variable initialization and maintain robustness in applications.
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