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This library provides some basic shim methods to make older browsers more ECMAScript 5 compatible. For newer browsers, the built-in methods will be used.


  • Function.prototype.bind
  • Array.isArray
  • Array.prototype.forEach
  • Array.prototype.filter
  • Array.prototype.every
  • Array.prototype.some
  • Array.prototype.reduce
  • Array.prototype.reduceRight
  • Array.prototype.indexOf
  • Array.prototype.lastIndexOf
  • Object.keys
  • Date.prototype.toISOString
  • Date.prototype.toJSON
  • String.prototype.trim


This module is modeled after the great es5-shim module. If you're looking for a shim module that has greater completeness at the cost of larger code size go for es5-shim.