msb-public
/
30-Days-Of-JavaScript
mirror of https://github.com/Asabeneh/30-Days-Of-JavaScript
1
0
Code Issues Projects Releases Wiki Activity

content restructured

Browse Source
pull/16/head
Asabeneh 6 years ago
parent ea884ca9e8
commit 07e02ec446
1 changed files with 53 additions and 44 deletions
Show Stats Download Patch File Download Diff File

97
02_Day/02_day_data_types.md
Unescape View File

@ -488,16 +488,16 @@ Asabeneh
let string = '30 Days Of JavaScript'
console.log(string.includes('Days')) // true
console.log(string.includes('days')) // false
console.log(string.includes('Script')) // true
console.log(string.includes('script')) // false
console.log(string.includes('Script')) // true
console.log(string.includes('script')) // false
console.log(string.includes('java')) // false
console.log(string.includes('Java')) // true
let country = 'Finland'
console.log(country.includes('fin')) // false
console.log(country.includes('Fin')) // true
console.log(country.includes('land')) // true
console.log(country.includes('Land')) // false
console.log(country.includes('fin')) // false
console.log(country.includes('Fin')) // true
console.log(country.includes('land')) // true
console.log(country.includes('Land')) // false
```
10. *replace()*: takes to parameter the old substring and new substring.
@ -592,14 +592,14 @@ string.startsWith(substring)
```js
let string = 'Love is the best to in this world'
console.log(string.startsWith('Love')) // true
console.log(string.startsWith('love')) // false
console.log(string.startsWith('world')) // false
console.log(string.startsWith('Love')) // true
console.log(string.startsWith('love')) // false
console.log(string.startsWith('world')) // false
let country = 'Finland'
console.log(country.startsWith('Fin')) // true
console.log(country.startsWith('fin')) // false
console.log(country.startsWith('land')) // false
console.log(country.startsWith('Fin')) // true
console.log(country.startsWith('fin')) // false
console.log(country.startsWith('land')) // false
```
17. *endsWith*: it takes a substring as an argument and it checks if the string starts with that specified substring. It returns a boolean(true or false).
@ -610,14 +610,14 @@ string.endsWith(substring)
```js
let string = 'Love is the best to in this world'
console.log(string.endsWith('world')) // true
console.log(string.endsWith('love')) // false
console.log(string.endsWith('world')) // true
console.log(string.endsWith('love')) // false
console.log(string.endsWith('in this world')) // true
let country = 'Finland'
console.log(country.endsWith('land')) // true
console.log(country.endsWith('fin')) // false
console.log(country.endsWith('Fin')) // false
console.log(country.endsWith('land')) // true
console.log(country.endsWith('fin')) // false
console.log(country.endsWith('Fin')) // false
```
18. *search*: it takes a substring as an argument and it returns the index of the first match.
@ -635,8 +635,8 @@ console.log(string.search('love')) // 2
```js
let string = 'love'
let patternOne = /love/ // with out any flag
let patternTwo = /love/gi // g-means to search in the whole text, i - case insensitive
let patternOne = /love/ // with out any flag
let patternTwo = /love/gi // g-means to search in the whole text, i - case insensitive
```
```js
@ -645,24 +645,31 @@ string.match(substring)
```js
let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
console.log(string.match('love')) //
/*
output
console.log(string.match('love'))
```
```sh
//output
["love", index: 2, input: "I love JavaScript. If you do not love JavaScript what else can you love.", groups: undefined]
*/
```
```js
let pattern = /love/gi
console.log(string.match(pattern)) // ["love", "love", "love"]
console.log(string.match(pattern)) // ["love", "love", "love"]
```
Let us extract numbers from text using regular expression. This is not regular expression section, no panic.
```js
let txt = 'In 2019, I run 30 Days of Pyhton. Now, in 2020 I super exited to start this challenge'
let regEx = /\d+/ // d with escape character means d not a normal d instead acts a digit
// + means one or more digit numbers,
let txt = 'In 2019, I run 30 Days of Python. Now, in 2020 I super exited to start this challenge'
let regEx = /\d+/
// d with escape character means d not a normal d instead acts a digit
// + means one or more digit numbers,
// if there is g after that it means global, search everywhere.
console.log(txt.match(regEx)) // ["2", "0", "1", "9", "3", "0", "2", "0", "2", "0"]
console.log(txt.match(regEx)) // ["2", "0", "1", "9", "3", "0", "2", "0", "2", "0"]
console.log(txt.match(/\d+/g)) // ["2019", "30", "2020"]
```
@ -688,21 +695,23 @@ console.log(string.repeat(10)) // lovelovelovelovelovelovelovelovelovelove
// Different python data types
// Let's declare different data types
let firstName = 'Asabeneh' // string
let lastName = 'Yetayeh' // string
let country = 'Finland' // string
let city = 'Helsinki' // string
let age = 250 // int, it is not my real age, do not worry about it
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) // boolean
console.log(typeof false) // boolean
console.log(typeof NaN) // number
console.log(typeof undefined) // undefined
console.log(typeof null) // object
let firstName = 'Asabeneh' // string
let lastName = 'Yetayeh' // string
let country = 'Finland' // string
let city = 'Helsinki' // string
let age = 250 // int, it is not my real age, do not worry about it
let job
console.log(typeof 'Asabeneh') // string
console.log(typeof firstName) // string
console.log(typeof 10) // number
console.log(typeof 3.14) // number
console.log(typeof true) // boolean
console.log(typeof false) // boolean
console.log(typeof NaN) // number
console.log(typeof job) // undefined
console.log(typeof undefined) // undefined
console.log(typeof null) // object
```
### Changing data type(Casting)
@ -845,7 +854,7 @@ The quote 'There is no exercise better for the heart than reaching down and lift
```
40. Check if typeof '10' is exactly equal to 10. If not make it exactly equal.
20. Check if parseInt('9.8') is equal to 10 if not make it exactly equal with 10.
41. Check if parseInt('9.8') is equal to 10 if not make it exactly equal with 10.
🎉 CONGRATULATIONS ! 🎉

Write Preview
Loading…
Cancel
Save