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bind was introduced in ES5 (and previously in most libraries) to fix this https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function

• huskyr 14y ago
  And trivially easy to shim for older browsers. I would really recommend using Function.prototype.bind instead of the 'var self = this' or library bind functions (such as $.proxy), it's just the way it should be written :)
  • jessaustin 14y ago
    To confirm my understanding, would the erroneous line from the comment above be rewritten like: button.onclick = obj.func.bind(obj); So un-DRY! It's almost admirable, how blatant a hack this is.