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Filename : get-json-replacer-function.js

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'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var isArray = require('../internals/is-array');
var isCallable = require('../internals/is-callable');
var classof = require('../internals/classof-raw');
var toString = require('../internals/to-string');

var push = uncurryThis([].push);

module.exports = function (replacer) {
  if (isCallable(replacer)) return replacer;
  if (!isArray(replacer)) return;
  var rawLength = replacer.length;
  var keys = [];
  for (var i = 0; i < rawLength; i++) {
    var element = replacer[i];
    if (typeof element == 'string') push(keys, element);
    else if (typeof element == 'number' || classof(element) === 'Number' || classof(element) === 'String') push(keys, toString(element));
  }
  var keysLength = keys.length;
  var root = true;
  return function (key, value) {
    if (root) {
      root = false;
      return value;
    }
    if (isArray(this)) return value;
    for (var j = 0; j < keysLength; j++) if (keys[j] === key) return value;
  };
};