In TypeScript, interfaces are used to define the structure of objects, but they do not provide default values for properties.<\/p>\n\n\n\n
However, you can define optional properties using the Here’s an example of how we can define an interface with optional properties and set default values for the properties:<\/p>\n\n\n\n In this example, the If we want to set default values for required properties, we can use a type assertion to cast the value to the expected type:<\/p>\n\n\n\n In this example, the “ To set up a default value with an\u00a0interface, we can also use the Typescript Pick <\/strong>Utility type\u00a0like so:<\/p>\n\n\n\n In TypeScript, interfaces are used to define the structure of objects, but they do not provide default values for properties. However, you can define optional properties using the ? operator, and you can also set default values for object properties when you define the object. Here’s an example of how we can define an interface […]<\/p>\n","protected":false},"author":1,"featured_media":1993,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[83],"tags":[680,372,463,681,615],"_links":{"self":[{"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/2650"}],"collection":[{"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=2650"}],"version-history":[{"count":1,"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/2650\/revisions"}],"predecessor-version":[{"id":2651,"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/2650\/revisions\/2651"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/media\/1993"}],"wp:attachment":[{"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=2650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=2650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nguenkam.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=2650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}?<\/code> <\/strong>operator, and you can also set default values for object properties when you define the object.<\/p>\n\n\n\ninterface Person {\r\n name: string;\r\n age?: number;\r\n gender?: string;\r\n}\r\n\r<\/code><\/pre>\n\n\n\nPerson<\/code> interface defines three properties: name<\/span><\/code>, age<\/span><\/code>, and gender<\/span><\/code>. The age<\/code> and gender<\/code> properties are optional, as indicated by the ?<\/code> operator<\/strong>.<\/p>\n\n\n\nexport interface Person {\r\n name: string;\r\n age: number;\r\n gender: string;\r\n}\r\n\r\nexport const defaultsPerson = {\r\n name: 'John',\r\n age: 30,\r\n gender: 'male',\r\n} as Person;\r\n<\/code><\/pre>\n\n\n\ndefaultsPerson<\/code>” object has the same properties as the Person<\/code> interface, but we’re using a type assertion to tell TypeScript that the object should be treated as a Person<\/code> object.<\/p>\n\n\n\nAlternative: <\/h4>\n\n\n\n
interface IPerson {\r\n name: string;\r\n role: string;\r\n}\r\n\r\nconst defaults: Pick<IPerson, 'role'> = {\r\n role: 'user'\r\n}\r\n\r\nconst person: IPerson = {\r\n ...defaults,\r\n name: 'Tim'\r\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"