Function binding
javascript.info
When passing object methods as callbacks, for instance to setTimeout, there’s a known problem: "losing this". this.firstName it tries to get window.firstName, which does not exist. The result of func.bind(context) is a special function-like “exotic object”, that is callable as function and transpare
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- When passing object methods as callbacks, for instance to setTimeout, there’s a known problem: "losing this".
- this.firstName it tries to get window.firstName, which does not exist.
- The result of func.bind(context) is a special function-like “exotic object”, that is callable as function and transparently passes the call to func setting this=context.
- In other words, calling boundFunc is like func with fixed this.
- All arguments are passed to the original func “as is”, for instance:
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