what does iterating through an object's properties means code example

Example 1: loop an object properties in ts

Object.keys(obj).forEach(e => console.log(`key=${e}  value=${obj[e]}`));

Example 2: javascript iterate through object attributes

for (var prop in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, prop)) {
        // do stuff
    }
}