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Q&A What's the difference between =, == and === operators in JavaScript?

1. = = is an assignment operator in JavaScript, it is used to assign a value to a variable. e.g: const test = 1; console.log(test); // expected output: 1. In the above example, we have ass...

posted 3y ago by Kevin M. Mansour‭ · edited 3y ago by Kevin M. Mansour‭

Answer

#3: Post edited by

Kevin M. Mansour‭ · 2021-07-28T05:42:49Z (over 3 years ago)
Cleaning Up.

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~~## 1. `=`.~~
`=` is an assignment operator in JavaScript, it is used to assign a value to a variable. e.g:
```js
const test = 1;
console.log(test);
// expected output: 1.
```
In the above example, we have assigned the value `1` to the variable `test` using the assignment operator `=`.
Here is an another examples from MDN:
```
const x = 2;
const y = 3;
console.log(x);
// expected output: 2.
console.log(x = y + 1); // 3 + 1
// expected output: 4.
console.log(x = x * y); // 4 * 3
// expected output: 12.
```
Learn more about `=` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment).
~~## 2. `==`.~~
`==` is a comparison operator in JavaScript, it attempts to convert and compare operands that are of different types,
returning a boolean result (`true` Or `false`). e.g:
```js
console.log(1 == 1);
// expected output: true.
```
In the above example, we compared `1`, which is a number, to other `1`, which is also a number, that mean the expected output will be `true`
since they are the same type, we done this using the comparison operator `==`.
Here is an another examples from MDN:
```js
console.log('hello' == 'hello');
// expected output: true.
console.log(1 == "1");
// expected output: true.
console.log(0 == false);
// expected output: true.
```
Learn more about `==` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality).
~~## 3. `===`.~~
`===` is a strict equality comparison operator in JavaScript, it always considers operands of different types to be different,
returning a boolean result (`true` Or `false`). e.g:
```js
console.log(true === "true");
// expected output: false.
```
Since `===` considers operands of different types to be different, so `true` is considered `1` and `"true"` is considered `NaN`,
so the expected output will be `false` since they different types, we done this using the strict equality comparison operator `===`.
Here is an another examples from MDN:
```js
console.log(1 === 1);
// expected output: true.
console.log('hello' === 'hello');
// expected output: true.
console.log('1' === 1);
// expected output: false.
console.log(0 === false);
// expected output: false.
```
~~Learn more about `===` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality).~~

## 1. `=`
`=` is an assignment operator in JavaScript, it is used to assign a value to a variable. e.g:
```js
const test = 1;
console.log(test);
// expected output: 1.
```
In the above example, we have assigned the value `1` to the variable `test` using the assignment operator `=`.
Here is an another examples from MDN:
```
const x = 2;
const y = 3;
console.log(x);
// expected output: 2.
console.log(x = y + 1); // 3 + 1
// expected output: 4.
console.log(x = x * y); // 4 * 3
// expected output: 12.
```
Learn more about `=` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment).
## 2. `==`
`==` is a comparison operator in JavaScript, it attempts to convert and compare operands that are of different types,
returning a boolean result (`true` Or `false`). e.g:
```js
console.log(1 == 1);
// expected output: true.
```
In the above example, we compared `1`, which is a number, to other `1`, which is also a number, that mean the expected output will be `true`
since they are the same type, we done this using the comparison operator `==`.
Here is an another examples from MDN:
```js
console.log('hello' == 'hello');
// expected output: true.
console.log(1 == "1");
// expected output: true.
console.log(0 == false);
// expected output: true.
```
Learn more about `==` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality).
## 3. `===`
`===` is a strict equality comparison operator in JavaScript, it always considers operands of different types to be different,
returning a boolean result (`true` Or `false`). e.g:
```js
console.log(true === "true");
// expected output: false.
```
Since `===` considers operands of different types to be different, so `true` is considered `1` and `"true"` is considered `NaN`,
so the expected output will be `false` since they different types, we done this using the strict equality comparison operator `===`.
Here is an another examples from MDN:
```js
console.log(1 === 1);
// expected output: true.
console.log('hello' === 'hello');
// expected output: true.
console.log('1' === 1);
// expected output: false.
console.log(0 === false);
// expected output: false.
```
Learn more about `===` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality).
## Summarize
1. `=` is an assignment operator.
2. `==` is a comparison operator.
3. `===` is a strict equality comparison operator.

#2: Post edited by

Kevin M. Mansour‭ · 2021-07-28T05:25:00Z (over 3 years ago)
Minor Stuff

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## 1. `=`.
`=` is an assignment operator in JavaScript, it is used to assign a value to a variable. e.g:
```js
const test = 1;
console.log(test);
// expected output: 1.
```
In the above example, we have assigned the value `1` to the variable `test` using the assignment operator `=`.
Here is an another examples from MDN:
```
const x = 2;
const y = 3;
console.log(x);
// expected output: 2.
console.log(x = y + 1); // 3 + 1
// expected output: 4.
console.log(x = x * y); // 4 * 3
// expected output: 12.
```
Learn more about `=` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment).
## 2. `==`.
`==` is a comparison operator in JavaScript, it attempts to convert and compare operands that are of different types,
returning a boolean result (`true` Or `false`). e.g:
```js
console.log(1 == 1);
// expected output: true.
```
In the above example, we compared `1`, which is a number, to other `1`, which is also a number, that mean the expected output will be `true`
since they are the same type, we done this using the comparison operator `==`.
Here is an another examples from MDN:
```js
console.log('hello' == 'hello');
// expected output: true.
console.log(1 == "1");
// expected output: true.
console.log(0 == false);
// expected output: true.
```
Learn more about `==` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality).
## 3. `===`.
`===` is a strict equality comparison operator in JavaScript, it always considers operands of different types to be different,
~~returning a boolean result(`true` Or `false`). e.g:~~
```js
console.log(true === "true");
// expected output: false.
```
Since `===` considers operands of different types to be different, so `true` is considered `1` and `"true"` is considered `NaN`,
so the expected output will be `false` since they different types, we done this using the strict equality comparison operator `===`.
Here is an another examples from MDN:
```js
console.log(1 === 1);
// expected output: true.
console.log('hello' === 'hello');
// expected output: true.
console.log('1' === 1);
// expected output: false.
console.log(0 === false);
// expected output: false.
```
Learn more about `===` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality).

## 1. `=`.
`=` is an assignment operator in JavaScript, it is used to assign a value to a variable. e.g:
```js
const test = 1;
console.log(test);
// expected output: 1.
```
In the above example, we have assigned the value `1` to the variable `test` using the assignment operator `=`.
Here is an another examples from MDN:
```
const x = 2;
const y = 3;
console.log(x);
// expected output: 2.
console.log(x = y + 1); // 3 + 1
// expected output: 4.
console.log(x = x * y); // 4 * 3
// expected output: 12.
```
Learn more about `=` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment).
## 2. `==`.
`==` is a comparison operator in JavaScript, it attempts to convert and compare operands that are of different types,
returning a boolean result (`true` Or `false`). e.g:
```js
console.log(1 == 1);
// expected output: true.
```
In the above example, we compared `1`, which is a number, to other `1`, which is also a number, that mean the expected output will be `true`
since they are the same type, we done this using the comparison operator `==`.
Here is an another examples from MDN:
```js
console.log('hello' == 'hello');
// expected output: true.
console.log(1 == "1");
// expected output: true.
console.log(0 == false);
// expected output: true.
```
Learn more about `==` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality).
## 3. `===`.
`===` is a strict equality comparison operator in JavaScript, it always considers operands of different types to be different,
returning a boolean result (`true` Or `false`). e.g:
```js
console.log(true === "true");
// expected output: false.
```
Since `===` considers operands of different types to be different, so `true` is considered `1` and `"true"` is considered `NaN`,
so the expected output will be `false` since they different types, we done this using the strict equality comparison operator `===`.
Here is an another examples from MDN:
```js
console.log(1 === 1);
// expected output: true.
console.log('hello' === 'hello');
// expected output: true.
console.log('1' === 1);
// expected output: false.
console.log(0 === false);
// expected output: false.
```
Learn more about `===` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality).

#1: Initial revision by

Kevin M. Mansour‭ · 2021-07-28T05:21:59Z (over 3 years ago)

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## 1. `=`.

`=` is an assignment operator in JavaScript, it is used to assign a value to a variable. e.g:

```js
const test = 1;

console.log(test);
// expected output: 1.
```

In the above example, we have assigned the value `1` to the variable `test` using the assignment operator `=`.

Here is an another examples from MDN:

```
const x = 2;
const y = 3;

console.log(x);
// expected output: 2.

console.log(x = y + 1); // 3 + 1
// expected output: 4.

console.log(x = x * y); // 4 * 3
// expected output: 12.
```

Learn more about `=` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment).

## 2. `==`.

`==` is a comparison operator in JavaScript, it attempts to convert and compare operands that are of different types,
returning a boolean result (`true` Or `false`). e.g:
 
```js
console.log(1 == 1);
// expected output: true.
```

In the above example, we compared `1`, which is a number, to other `1`, which is also a number, that mean the expected output will be `true` 
since they are the same type, we done this using the comparison operator `==`.

Here is an another examples from MDN:

```js
console.log('hello' == 'hello');
// expected output: true.

console.log(1 == "1");
// expected output: true.

console.log(0 == false);
// expected output: true.
```

Learn more about `==` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality).

## 3. `===`.

`===` is a strict equality comparison operator in JavaScript, it always considers operands of different types to be different, 
returning a boolean result(`true` Or `false`). e.g:

```js
console.log(true === "true");
// expected output: false.
```

Since `===` considers operands of different types to be different, so `true` is considered `1` and `"true"` is considered `NaN`, 
so the expected output will be `false` since they different types, we done this using the strict equality comparison operator `===`.

Here is an another examples from MDN:

```js
console.log(1 === 1);
// expected output: true.

console.log('hello' === 'hello');
// expected output: true.

console.log('1' ===  1);
// expected output: false.

console.log(0 === false);
// expected output: false.
```

Learn more about `===` at [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality).

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