Casting to string in JavaScript

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They do behave differently when the value is null.

  • null.toString() throws an error – Cannot call method ‘toString’ of null
  • String(null) returns – “null”
  • null + "" also returns – “null”

Very similar behaviour happens if value is undefined (see jbabey’s answer).

Other than that, there is a negligible performance difference, which, unless you’re using them in huge loops, isn’t worth worrying about.

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