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30-Days-Of-JavaScript
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Asabeneh 6 years ago
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02_Day/02_day_data_types.md
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@ -488,16 +488,16 @@ Asabeneh
let string = '30 Days Of JavaScript' let string = '30 Days Of JavaScript'
console.log(string.includes('Days')) // true console.log(string.includes('Days')) // true
console.log(string.includes('days')) // false console.log(string.includes('days')) // false
console.log(string.includes('Script')) // true console.log(string.includes('Script')) // true
console.log(string.includes('script')) // false console.log(string.includes('script')) // false
console.log(string.includes('java')) // false console.log(string.includes('java')) // false
console.log(string.includes('Java')) // true console.log(string.includes('Java')) // true
let country = 'Finland' let country = 'Finland'
console.log(country.includes('fin')) // false console.log(country.includes('fin')) // false
console.log(country.includes('Fin')) // true console.log(country.includes('Fin')) // true
console.log(country.includes('land')) // true console.log(country.includes('land')) // true
console.log(country.includes('Land')) // false console.log(country.includes('Land')) // false
``` ```
10. *replace()*: takes to parameter the old substring and new substring. 10. *replace()*: takes to parameter the old substring and new substring.
@ -592,14 +592,14 @@ string.startsWith(substring)
```js ```js
let string = 'Love is the best to in this world' let string = 'Love is the best to in this world'
console.log(string.startsWith('Love')) // true console.log(string.startsWith('Love')) // true
console.log(string.startsWith('love')) // false console.log(string.startsWith('love')) // false
console.log(string.startsWith('world')) // false console.log(string.startsWith('world')) // false
let country = 'Finland' let country = 'Finland'
console.log(country.startsWith('Fin')) // true console.log(country.startsWith('Fin')) // true
console.log(country.startsWith('fin')) // false console.log(country.startsWith('fin')) // false
console.log(country.startsWith('land')) // 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). 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 ```js
let string = 'Love is the best to in this world' let string = 'Love is the best to in this world'
console.log(string.endsWith('world')) // true console.log(string.endsWith('world')) // true
console.log(string.endsWith('love')) // false console.log(string.endsWith('love')) // false
console.log(string.endsWith('in this world')) // true console.log(string.endsWith('in this world')) // true
let country = 'Finland' let country = 'Finland'
console.log(country.endsWith('land')) // true console.log(country.endsWith('land')) // true
console.log(country.endsWith('fin')) // false console.log(country.endsWith('fin')) // false
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. 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 ```js
let string = 'love' let string = 'love'
let patternOne = /love/ // with out any flag let patternOne = /love/ // with out any flag
let patternTwo = /love/gi // g-means to search in the whole text, i - case insensitive let patternTwo = /love/gi // g-means to search in the whole text, i - case insensitive
``` ```
```js ```js
@ -645,24 +645,31 @@ string.match(substring)
```js ```js
let string = 'I love JavaScript. If you do not love JavaScript what else can you love.' let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
console.log(string.match('love')) // console.log(string.match('love'))
/* ```
output
```sh
//output
["love", index: 2, input: "I love JavaScript. If you do not love JavaScript what else can you love.", groups: undefined] ["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 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. Let us extract numbers from text using regular expression. This is not regular expression section, no panic.
```js ```js
let txt = 'In 2019, I run 30 Days of Pyhton. Now, in 2020 I super exited to start this challenge' 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 let regEx = /\d+/
// + means one or more digit numbers,
// 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. // 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"] console.log(txt.match(/\d+/g)) // ["2019", "30", "2020"]
``` ```
@ -688,21 +695,23 @@ console.log(string.repeat(10)) // lovelovelovelovelovelovelovelovelovelove
// Different python data types // Different python data types
// Let's declare different data types // Let's declare different data types
let firstName = 'Asabeneh' // string let firstName = 'Asabeneh' // string
let lastName = 'Yetayeh' // string let lastName = 'Yetayeh' // string
let country = 'Finland' // string let country = 'Finland' // string
let city = 'Helsinki' // string let city = 'Helsinki' // string
let age = 250 // int, it is not my real age, do not worry about it let age = 250 // int, it is not my real age, do not worry about it
let job
console.log(typeof 'Asabeneh') // str
console.log(typeof firstName) // str console.log(typeof 'Asabeneh') // string
console.log(typeof 10) // number console.log(typeof firstName) // string
console.log(typeof 3.14) // number console.log(typeof 10) // number
console.log(typeof true) // boolean console.log(typeof 3.14) // number
console.log(typeof false) // boolean console.log(typeof true) // boolean
console.log(typeof NaN) // number console.log(typeof false) // boolean
console.log(typeof undefined) // undefined console.log(typeof NaN) // number
console.log(typeof null) // object console.log(typeof job) // undefined
console.log(typeof undefined) // undefined
console.log(typeof null) // object
``` ```
### Changing data type(Casting) ### 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. 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 ! 🎉 🎉 CONGRATULATIONS ! 🎉

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