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30-Days-Of-JavaScript
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Asabeneh 5 years ago
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6
02_Day/02_day_data_types.md
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@ -698,7 +698,11 @@ console.log(typeof 'Asabeneh') // str
console.log(typeof firstName) // str
console.log(typeof 10) // number
console.log(typeof 3.14) // number
console.log(typeof true) // bool
console.log(typeof true) // boolean
console.log(typeof false) // boolean
console.log(typeof NaN) // number
console.log(typeof undefined) // undefined
console.log(typeof null) // object
```
### Changing data type(Casting)

92
03_Day/03_booleans_operators_date.md
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@ -167,19 +167,32 @@ In programming we compare values, we use comparison operators to compare two val
**Example: Comparison Operators**
```js
console.log(3 > 2) // true, because 3 is greater than 2
console.log(3 >= 2) // true, because 3 is greater than 2
console.log(3 < 2) // false, because 3 is greater than 2
console.log(2 < 3) // true, because 2 is less than 3
console.log(2 <= 3) // true, because 2 is less than 3
console.log(3 == 2) // false, because 3 is not equal to 2
console.log(3 != 2) // true, because 3 is not equal to 2
console.log(3 == '3') // true, compare only value
console.log(3 === '3') // false, compare both value and data type
console.log(3 !== '3') // true, compare both value and data type
console.log(3 !== '3') // true, compare both value and data type
console.log(3 != 3) // false, compare only value
console.log(3 !== 3) // false, compare both value and data type
console.log(3 > 2) // true, because 3 is greater than 2
console.log(3 >= 2) // true, because 3 is greater than 2
console.log(3 < 2) // false, because 3 is greater than 2
console.log(2 < 3) // true, because 2 is less than 3
console.log(2 <= 3) // true, because 2 is less than 3
console.log(3 == 2) // false, because 3 is not equal to 2
console.log(3 != 2) // true, because 3 is not equal to 2
console.log(3 == '3') // true, compare only value
console.log(3 === '3') // false, compare both value and data type
console.log(3 !== '3') // true, compare both value and data type
console.log(3 !== '3') // true, compare both value and data type
console.log(3 != 3) // false, compare only value
console.log(3 !== 3) // false, compare both value and data type
console.log(0 == false) // true, equivalent
console.log(0 == '') // true, equivalent
console.log(0 == ' ') // true, equivalent
console.log(0 === '') // false, not exactly the same
console.log(0 === false) // false, not exactly the same
console.log(1 == true) // true, equivalent
console.log(1 === true ) // false, not exactly the same
console.log(undefined == null) // true
console.log(undefined === null) // true
console.log(NaN == NaN) // false, not equal
console.log(NaN === NaN) // false
console.log(typeof NaN) // number
console.log('mango'.length == 'avocado'.length) // false
console.log('mango'.length != 'avocado'.length) // true
@ -190,6 +203,9 @@ console.log('tomato'.length == 'potato'.length) // true
console.log('python'.length > 'dragon'.length) // false
```
Try to understand the above comparisons with some logic. Remember without any logic might be difficult.
JavaScript is some how a wired kind of programming language. JavaScript code run and give you a result but unless you are good at it may not be the desired result. The following [link](https://dorey.github.io/JavaScript-Equality-Table/) has an exhaustive list of comparison of data types.
### Logical Operators
The following symbols are the common logical operators:
@ -199,20 +215,26 @@ The following symbols are the common logical operators:
! negates true to false, false to true.
```js
//&& ampersand example
const check = 4 > 3 && 10 > 5; // true and true -> true
const check = 4 > 3 && 10 < 5; // true and false -> false
const check = 4 < 3 && 10 < 5; // false and false -> false
//|| pipe or, example
const check = 4 > 3 || 10 > 5; // true and true -> true
const check = 4 > 3 || 10 < 5; // true and false -> true
const check = 4 < 3 || 10 < 5; // false and false -> false
//&& ampersand operator example
const check = 4 > 3 && 10 > 5 // true and true -> true
const check = 4 > 3 && 10 < 5 // true and false -> false
const check = 4 < 3 && 10 < 5 // false and false -> false
//|| pipe or operator, example
const check = 4 > 3 || 10 > 5 // true and true -> true
const check = 4 > 3 || 10 < 5 // true and false -> true
const check = 4 < 3 || 10 < 5 // false and false -> false
//! Negation examples
let check = 4 > 3; // -> true
let check = !(4 > 3); // -> false
let isLightOn = true;
let isLightOff = !isLightOn; // -> false
let isMarried = !false; // -> true
let check = 4 > 3 // true
let check = !(4 > 3) // false
let isLightOn = true
let isLightOff = !isLightOn // false
let isMarried = !false // true
```
### Increment Operator
@ -223,7 +245,7 @@ In JavaScrip we use the increment operator to increase a value stored in a varia
```js
let count = 0
console.log(++count) // 1
console.log(++count) // 1
console.log(count) // 1
```
@ -231,7 +253,7 @@ console.log(count) // 1
```js
let count = 0
console.log(count++) // 0
console.log(count++) // 0
console.log(count) // 1
```
@ -245,7 +267,7 @@ In JavaScrip we use the decrement operator to decrease a value stored in a varia
```js
let count = 0
console.log(--count) // -1
console.log(--count) // -1
console.log(count) // -1
```
@ -253,7 +275,7 @@ console.log(count) // -1
```js
let count = 0
console.log(count--) // 0
console.log(count--) // 0
console.log(count) // -1
```
@ -266,12 +288,12 @@ Another way to write conditionals is using ternary operators. Look at the follow
let isRaining = true
isRaining
? console.log('You need a rain coat.')
: console.log('No need for a rain coat.');
: console.log('No need for a rain coat.')
isRaining = false
isRaining
? console.log('You need a rain coat.')
: console.log('No need for a rain coat.');
: console.log('No need for a rain coat.')
```
```sh
@ -283,12 +305,12 @@ No need for a rain coat.
let number = 5
number > 0
? console.log(`${number} is a positive number`)
: console.log(`${number} is a number number`);
: console.log(`${number} is a number number`)
number = -5
number > 0
? console.log(`${number} is a positive number`)
: console.log(`${number} is a number number`);
: console.log(`${number} is a number number`)
```
```sh
@ -554,7 +576,7 @@ Find the length of python and jargon and make a falsy comparison statement.
```js
let firstName = 'Asabeneh'
let lastName = 'Yetayeh
let lastName = 'Yetayeh'
```
```sh

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