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‎02_Day/02_day_data_types.md‎

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```
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1. *indexOf()*: Takes a substring, and if the substring exists, it returns the first position of the substring. However if the substring does not exist, it returns -1
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13. *indexOf()*: Takes a substring and if the substring exists in a string it returns the first position of the substring if does not exist it returns -1
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```js
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string.indexOf(substring)
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console.log(string.indexOf('script')) // -1
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```
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1. *lastIndexOf()*: Takes a substring, and if the substring exists, it returns the last position of the substring. However if it does not exist, it returns -1
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14. *lastIndexOf()*: Takes a substring and if the substring exists in a string it returns the last position of the substring if it does not exist it returns -1
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```js
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//syntax
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console.log(country.startsWith('land')) // false
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```
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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).
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17. *endsWith*: it takes a substring as an argument and it checks if the string ends with that specified substring. It returns a boolean(true or false).
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```js
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string.endsWith(substring)
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The quote 'There is no exercise better for the heart than reaching down and lifting people up.' by John Holmes teaches us to help one another.
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```
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2. Using console.log() print out the following quote by Mother Teresa:
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```sh
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4 1 4 16 64
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5 1 5 25 125
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```
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12. Use __substr__ to slice out the phrase __because because because__ from the following sentence:__'You cannot end a sentence with because because because is a conjunction'__
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### Exercises: Level 3

‎02_Day/string_methods/match.js‎

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// Let us extract numbers from text using regular expression. This is not regular expression section, no panic.
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let txt = 'In 2019, I run 30 Days of Pyhton. Now, in 2020 I super exited to start this challenge'
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let regEx = /\d+/ // d with escape character means d not a normal d instead acts a digit
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let regEx = /\d/g // d with escape character means d not a normal d instead acts a digit
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// + means one or more digit numbers,
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// if there is g after that it means global, search everywhere.
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console.log(text.match(regEx)) // ["2", "0", "1", "9", "3", "0", "2", "0", "2", "0"]
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console.log(text.match(/\d+/g)) // ["2019", "30", "2020"]
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console.log(txt.match(regEx)) // ["2", "0", "1", "9", "3", "0", "2", "0", "2", "0"]
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console.log(txt.match(/\d+/g)) // ["2019", "30", "2020"]

‎07_Day/07_day_functions.md‎

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function sumArrayValues(arr) {
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let sum = 0;
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for (let i = 0; i < arr.length; i++) {
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sum = sum + numbers[i];
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sum = sum + arr[i];
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}
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return sum;
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}

‎26_Day/26_day_dom_day_6.md‎

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</div>
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[<< Day 24](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/24_Day/24_day_dom_day_4.md) | [Day 27 >>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/27_Day/27_day_dom_day_7.md)
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[<< Day 25](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/25_Day/25_day_dom_day_5.md) | [Day 27 >>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/27_Day/27_day_dom_day_7.md)
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![Thirty Days Of JavaScript](../images/banners/day_1_26.png)
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‎28_Day/28_day_dom_day_8.md‎

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</div>
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[<< Day 27](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master27_Day27_day_dom_day_7.md) | [Day 29>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/29_Day/29_day_dom_day_9.md)
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[<< Day 27](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/27_Day/27_day_dom_day_7.md) | [Day 29>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/29_Day/29_day_dom_day_9.md)
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![Thirty Days Of JavaScript](../images/banners/day_1_28.png)
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🎉 CONGRATULATIONS ! 🎉
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[<< Day 27](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master27_Day27_day_dom_day_7.md) | [Day 29>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/29_Day/29_day_dom_day_9.md)
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[<< Day 27](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/27_Day/27_day_dom_day_7.md) | [Day 29>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/29_Day/29_day_dom_day_9.md)

‎29_Day/29_day_dom_day_9.md‎

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</div>
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[<< Day 27](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master27_Day27_day_dom_day_7.md) | [Day 29>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/29_Day/29_day_dom_day_9.md)
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[<< Day 28](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/28_Day/28_day_dom_day_8.md) | [Day 30>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/30_Day/30_day_dom_day_10.md)
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![Thirty Days Of JavaScript](../images/banners/day_1_29.png)
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🎉 CONGRATULATIONS ! 🎉
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[<< Day 28](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master28_Day28_day_dom_day_8.md) | [Day 30>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/30_Day/30_day_dom_day_10.md)
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[<< Day 28](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/28_Day/28_day_dom_day_8.md) | [Day 30>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/30_Day/30_day_dom_day_10.md)

‎30_Day/30_day_dom_day_10.md‎

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~![Congratulations](./../images/projects/congratulations.gif)
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[<< Day 29](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master29_Day29_day_dom_day_9.md) | [Day 30>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/30_Day/30_day_dom_day_10.md)
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[<< Day 29](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/29_Day/29_day_dom_day_9.md) | [Day 30>>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/30_Day/30_day_dom_day_10.md)

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