funcunit/site/node_modules/core-js/modules/$.to-index.js

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var toInteger = require('./$.to-integer')
  , max       = Math.max
  , min       = Math.min;
module.exports = function(index, length){
  index = toInteger(index);
  return index < 0 ? max(index + length, 0) : min(index, length);
};