Pre-recorded question

Question #26
How to loop through a JavaScript object?
Answer

The best way to iterate through JavaScript object on modern browsers is:

  1. to convert the object into JS array
  2. then to iterate through the array.


Here is an example:

var myObject = { string: "example", integer: 12 };

Object.entries(myObject).forEach(function ([key, value]) {
   console.log(key, value)
});

The expected console output is:

string example
integer 12

For older browsers (before ES6), the only way to loop through JS objects is to use a for ... in loop:

for (var property in object) {
	// Skip loop if the property is from prototype
	if (object.hasOwnProperty(property)) {
    	// Do awesome stuff here
	}
}
When you loop through an object with the  for ... in  loop, you need to check if the property belongs to the object or the to the prototype.


14 events in history
Answer by Alphonsio 06/20/2020 at 04:12:31 AM

The best way to iterate through JavaScript object on modern browsers is:

  1. to convert the object into JS array
  2. then to iterate through the array.


Here is an example:

var myObject = { string: "example", integer: 12 };

Object.entries(myObject).forEach(function ([key, value]) {
   console.log(key, value)
});

The expected console output is:

string example
integer 12

For older browsers (before ES6), the only way to loop through JS objects is to use a for ... in loop:

for (var property in object) {
	// Skip loop if the property is from prototype
	if (object.hasOwnProperty(property)) {
    	// Do awesome stuff here
	}
}
When you loop through an object with the  for ... in  loop, you need to check if the property belongs to the object or the to the prototype.


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How to loop through objects in JavaScript?
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How to iterate through JavaScript objects?
Question by Alphonsio 06/06/2020 at 03:14:37 PM
How to iterate through JavaScript object?
Answer by Alphonsio 06/06/2020 at 12:08:08 PM

The best way to iterate through JavaScript object on modern browser is:

  1. to convert the object into JS array
  2. then to iterate through the array.


Here is an example:

var myObject = { string: "example", integer: 12 };

Object.entries(myObject).forEach(function ([key, value]) {
   console.log(key, value)
});

The expected console output is:

string example
integer 12

For older browser (before ES6), the only way to loop through JS objects is to use a for ... in loop:

for (var property in object) {
	// Skip loop if the property is from prototype
	if (object.hasOwnProperty(property)) {
    	// Do awesome stuff here
	}
}
When you loop through an object with the  for ... in  loop, you need to check if the property belongs to the object or the to the prototype.


Answer by Alphonsio 06/06/2020 at 12:07:37 PM

The best way to iterate through JavaScript object on modern browser is:

  1. to convert the object into JS array
  2. then to iterate through the array.


Here is an example:

var myObject = { string: "example", integer: 12 };

Object.entries(myObject).forEach(function ([key, value]) {
   console.log(key, value)
});

The expected console output is:

string example
integer 12

For older browser (before ES6), the only way to loop through JS objects is to use a for ... in loop:

for (var property in object) {
	// Skip loop if the property is from prototype
	if (object.hasOwnProperty(property)) {
    	// Do awesome stuff here
	}
}
When you loop through an object with the  for ... in  loop, you need to check if the property belongs to the object or the to the prototype.


Answer by Alphonsio 05/20/2020 at 09:54:34 AM

The best way to iterate through JavaScript object is to convert the object into table with Object.keys(), Object.values() or Object.entries() before iterating through the table with Array.forEach().

  • Object.keys() returns an array of object keys [key]
  • Object.values() returns an array containing the object values [values]
  • Object.entries() returns an array containing the pairs keys and values [key, values]


Here is an example:

var myObject = { string: "example", integer: 12 };

Object.entries(myObject).forEach(function ([key, value]) {
   console.log(key, value)
});

The expected console output is:

string example
integer 12

Answer by Alphonsio 05/20/2020 at 09:54:15 AM

The best way to iterate through JavaScript object is to convert the object into table with Object.keys(), Object.values() or Object.entries() before iterating through the table with Array.forEach().

  • Object.keys() returns an a rray of object keys [key]
  • Object.values() re turns an arr ay containing the object values [values]
  • Object.entries() retur n an array containing the pairs keys and values [key, values]


Here is an example:

var myObject = { string: "example", integer: 12 };

Object.entries(myObject).forEach(function ([key, value]) {
   console.log(key, value)
});

The expected console output is:

string example
integer 12

Answer by Alphonsio 05/20/2020 at 09:53:53 AM

The best way to iterate through JavaScript object is to convert the object into table with Object.keys(), Object.values() or Object.entries() before iterating through the table with Array.forEach().

  • Object.keys() returns an a rray of object keys [key]
  • Object.values() re turns an arr ay containing the object values [values]
  • Object.entries() retur n an array containing the pairs keys and values [key, values]


Here is an example:

var obj = { string: "example", integer: 12 };

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

The expected console output is:

string example
integer 12

Answer by Alphonsio 05/03/2020 at 09:41:13 AM

The best way to iterate through JavaScript object is to convert the object into table with Object.keys() before iterating through the table with Array.forEach(). Here is an example:

var obj = { string: "example", integer: 12 };

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

The previous code should display in the console:

string example
integer 12

Question by Alphonsio 05/03/2020 at 09:41:03 AM
How to loop through a JavaScript object?
Answer by Alphonsio 05/03/2020 at 09:40:52 AM

The best way to iterate through JavaScript object is to convert the object into table with Object.keys() before iterating through the table with Array.forEach(). Here is an example:


var obj = { string: "example", integer: 12 };

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

The previous code should display in the console:

string example
integer 12

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