for in in javascript code example

Example 1: javascript loop object

let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}

Object.keys(obj).forEach(key => {
    console.log(key, obj[key]);
});
// key1 value1
// key2 value2
// key3 value3

// using for in - same output as above
for (let key in obj) {
  let value = obj[key];
  console.log(key, value);
}

Example 2: javascript for

let str = "";

for (let i = 0; i < 9; i++) {
  str = str + i;
}

console.log(str);
// expected output: "012345678"

Example 3: js loop over object

const object = {a: 1, b: 2, c: 3};

for (const property in object) {
  console.log(`${property}: ${object[property]}`);
}

Example 4: loop an object in javascript

var p = {
    "p1": "value1",
    "p2": "value2",
    "p3": "value3"
};

for (var key in p) {
    if (p.hasOwnProperty(key)) {
        console.log(key + " -> " + p[key]);
    }
}

Example 5: loop an object in javascript

var obj = { first: "John", last: "Doe" };

Object.keys(obj).forEach(function(key) {
    console.log(key, obj[key]);
});

Example 6: for in loop javascript

var person = {"name":"taylor","age":31};
for (property in person) {
	console.log(property,person[property]);
}
//name taylor
//age 31