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One way to iterate over all the strings in an object that contains various types of properties is to use a loop and check the data type of each property value. For example, in JavaScript, you can use the typeof operator to check if a property value is a string, and then perform a specific action on it (such as printing it to the console or pushing it to an array).

Here's an example code snippet that demonstrates how to iterate over all the strings in an object:

const myObject = {
  name: 'John',
  age: 30,
  address: {
    city: 'London',
    country: 'UK'
  },
  favoriteFoods: ['pizza', 'ice cream'],
  email: 'john@example.com'
};

const strings = [];

for (const prop in myObject) {
  if (typeof myObject[prop] === 'string') {
    strings.push(myObject[prop]);
  } else if (typeof myObject[prop] === 'object') {
    // recursively iterate over nested objects
    for (const nestedProp in myObject[prop]) {
      if (typeof myObject[prop][nestedProp] === 'string') {
        strings.push(myObject[prop][nestedProp]);
      }
    }
  } 
}

console.log(strings); // ['John', 'London', 'UK', 'john@example.com']

This code iterates over all the properties in myObject using a for...in loop, and checks if each property value is a string using the typeof operator. If it is a string, the value is added to an array called strings. If the property value is an object, the code recursively iterates over its properties to check if any of them are strings. The final output is an array of all the string values found in myObject.