Casting a number to a string in TypeScript

Question

Which is the the best way  if there is one  to cast from number to string in Typescript   var page number number   3  window location hash   page number     In this case the compiler throws the error      Type  number  is not assignable to type  string    Because location hash is a string   window location hash      page number    casting using    literal window location hash   String number     casting creating using the String   function   So which method is better

User · Answer

const page number   3  window location hash   page number as string     Error   quot Conversion of type  number  to type  string  may be a mistake because neither type sufficiently overlaps with the other  If this was intentional  convert the expression to  unknown  first  quot  - gt  You will get this error if you try to typecast number to string  So  first convert it to unknown and then to string   window location hash    page number as unknown  as string     Correct way

User · Answer

Just utilize toString or toLocaleString I d say  So   var page number number   3  window location hash   page number toLocaleString        These throw an error if page number is null or undefined  If you don t want that you can choose the fix appropriate for your situation      Fix 1  window location hash    page number    1  toLocaleString        Fix 2a  window location hash    page number    1  page number toLocaleString        Fix 2b  allows page number to be zero   window location hash    page number     0  amp  amp   page number     1  page number toLocaleString

User · Answer

One can also use the following syntax in typescript  Note the backtick        window location hash      page number

User · Answer

window location hash is a string  so do this  var page number  number   3  window location hash   String page number

User · Answer

Casting  is different than conversion  In this case  window location hash will auto-convert a number to a string  But to avoid a TypeScript compile error  you can do the string conversion yourself   window location hash      page number   window location hash   String page number      These conversions are ideal if you don t want an error to be thrown when page number is null or undefined  Whereas page number toString   and page number toLocaleString   will throw when page number is null or undefined   When you only need to cast  not convert  this is how to cast to a string in TypeScript   window location hash    lt string gt page number      or  window location hash   page number as string    The  lt string gt  or as string cast annotations tell the TypeScript compiler to treat page number as a string at compile time  it doesn t convert at run time     However  the compiler will complain that you can t assign a number to a string  You would have to first cast to  lt any gt   then to  lt string gt    window location hash    lt string gt  lt any gt page number     or window location hash   page number as any as string    So it s easier to just convert  which handles the type at run time and compile time   window location hash   String page number       Thanks to  RuslanPolutsygan for catching the string-number casting issue

User · Answer

Use the     symbol to cast a string to a number   window location hash    page number

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