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‎.gitignore‎

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day10.md
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01_02_03_days_backup.md
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test.md
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09_Day
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10_Day
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2019
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‎05_Day/05_day_arrays.md‎

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2020

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![Day 5](../images/banners/day_1_5.png)
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- [📔 Day 5](#-day-5)
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- [📔 Day 5](#%f0%9f%93%94-day-5)
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- [Arrays](#arrays)
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- [How to create an empty array](#how-to-create-an-empty-array)
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- [How to create an array with values](#how-to-create-an-array-with-values)
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- [Reversing array order](#reversing-array-order)
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- [Sorting elements in array](#sorting-elements-in-array)
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- [Array of arrays](#array-of-arrays)
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- [💻 Exercise](#-exercise)
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- [💻 Exercise](#%f0%9f%92%bb-exercise)
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# 📔 Day 5
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Splice: It takes three parameters:Starting position, number of times to be removed and number of items to be added.
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```js
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const numbers = [1, 2, 3, 4, 5];
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const numbers = [1, 2, 3, 4, 5]
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console.log(numbers.splice()) // -> remove all items
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```
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```js
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const numbers = [1, 2, 3, 4, 5]
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console.log(numbers.splice(0,1)) // remove the first item
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console.log(numbers.splice(3, 3, 6, 7, 8)) // -> [1,2,6,7,8] //it removes two item and replace three items
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```
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```js
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const numbers = [1, 2, 3, 4, 5];
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console.log(numbers.splice(3, 3, 6, 7, 8)) // -> [1, 2, 3, 6, 7, 8] //it removes two item and replace three items
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```
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#### Adding item to an array using push
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#### Removing the end element using pop
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Pop: Removing item in the end.
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pop: Removing item in the end.
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```js
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const numbers = [1, 2, 3, 4, 5]

‎08_Day/08_day_objects.md‎

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</div>
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[<< Day 7](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/09_Day/09_day_function_programming.md) | [Day 9 >>](#)
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[<< Day 7](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/07_Day/07_day_functions.md) | [Day 9 >>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/07_Day/07_day_higher_order_function.md)
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![Thirty Days Of JavaScript](../images/banners/day_1_8.png)
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- [Day 8](#day-8)
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- [📔 Day 8](#%f0%9f%93%94-day-8)
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- [Scope](#scope)
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- [Window Scope](#window-scope)
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- [Global scope](#global-scope)
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- [Checking properties using hasOwnProperty()](#checking-properties-using-hasownproperty)
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- [💻 Exercises](#%f0%9f%92%bb-exercises)
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# Day 8
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# 📔 Day 8
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## Scope
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1. Get all keys or properties of users object
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1. Get all the values of users object
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1. Use the countries object to print a country name, capital, populations and languages.
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1. \*\*\* Find the 10 most spoken languages:
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````js
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// Your output should look like this
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console.log(mostSpokenLanguages(countries, 10))
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[(91, 'English'),
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(45, 'French'),
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(25, 'Arabic'),
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(24, 'Spanish'),
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(9, 'Russian'),
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(9, 'Portuguese'),
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(8, 'Dutch'),
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(7, 'German'),
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(5, 'Chinese'),
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(4, 'Swahili'),
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(4, 'Serbian')]
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// Your output should look like this
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console.log(mostSpokenLanguages(countries, 3))
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[
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(91, 'English'),
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(45, 'French'),
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(25, 'Arabic')
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]```
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````
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1. \*\*\* Use countries_data.js file create a function which create the ten most populated countries
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````js
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console.log(mostPopulatedCountries(countries, 10))
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[
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{country: 'China', population: 1377422166},
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{country: 'India', population: 1295210000},
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{country: 'United States of America', population: 323947000},
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{country: 'Indonesia', population: 258705000},
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{country: 'Brazil', population: 206135893},
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{country: 'Pakistan', population: 194125062},
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{country: 'Nigeria', population: 186988000},
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{country: 'Bangladesh', population: 161006790},
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{country: 'Russian Federation', population: 146599183},
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{country: 'Japan', population: 126960000}
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]
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console.log(mostPopulatedCountries(countries, 3))
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[
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{country: 'China', population: 1377422166},
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{country: 'India', population: 1295210000},
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{country: 'United States of America', population: 323947000}
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]```
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````
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1. \*\*\* Try to develop a program which calculate measure of central tendency of a sample(mean, median, mode) and measure of variability(range, variance, standard deviation). In addition to those measures find the min, max, count, percentile, and frequency distribution of the sample. You can create an object called statistics and create all the functions which do statistical calculations as method for the statistics object. Check the output below.
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```js
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const ages = [31, 26, 34, 37, 27, 26, 32, 32, 26, 27, 27, 24, 32, 33, 27, 25, 26, 38, 37, 31, 34, 24, 33, 29, 26]
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console.log('Count:', statistics.count()) // 25
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console.log('Sum: ', statistics.sum()) // 744
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console.log('Min: ', statistics.min()) // 24
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console.log('Max: ', statistics.max()) // 38
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console.log('Range: ', statistics.range() // 14
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console.log('Mean: ', statistics.mean()) // 30
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console.log('Median: ',statistics.median()) // 29
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console.log('Mode: ', statistics.mode()) // {'mode': 26, 'count': 5}
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console.log('Variance: ',statistics.var()) // 17.5
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console.log('Standard Deviation: ', statistics.std()) // 4.2
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console.log('Variance: ',statistics.var()) // 17.5
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console.log('Frequency Distribution: ',statistics.freqDist()) # [(20.0, 26), (16.0, 27), (12.0, 32), (8.0, 37), (8.0, 34), (8.0, 33), (8.0, 31), (8.0, 24), (4.0, 38), (4.0, 29), (4.0, 25)]
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```
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```sh
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console.log(statistics.describe())
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Count: 25
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Sum: 744
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Min: 24
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Max: 38
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Range: 14
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Mean: 30
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Median: 29
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Mode: (26, 5)
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Variance: 17.5
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Standard Deviation: 4.2
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Frequency Distribution: [(20.0, 26), (16.0, 27), (12.0, 32), (8.0, 37), (8.0, 34), (8.0, 33), (8.0, 31), (8.0, 24), (4.0, 38), (4.0, 29), (4.0, 25)]
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```
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🎉 CONGRATULATIONS ! 🎉
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[<< Day 7](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/09_Day/09_day_function_programming.md) | [Day 9 >>](#)
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[<< Day 7](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/07_Day/07_day_functions.md) | [Day 9 >>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/07_Day/07_day_higher_order_function.md)

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