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- # Function declaration & Function expression
- ## Q1
- ```js
- console.log(square(5));
- function square(n) {
- return n*n;
- }
- ```
- - Error
- - 25
- - 5
- - 0
- ## Q2
- ```js
- console.log(square(5));
- var square = function(n) {
- return n*n;
- }
- ```
- - 25
- - Error
- - 5
- - 0
- ## Q3
- ```js
- var square = (n) => {
- return n*n;
- }
- console.log(square(3));
- ```
- - 25
- - 9
- - Error
- - 5
- ## Q4
- ```js
- let square = 3
- console.log(square(5))
- function square(n) {
- return n
- }
- ```
- - Error
- - 9
- - 0
- - 25
- ## Q5
- ```js
- let square = 3
- function square(n) {
- return n
- }
- console.log(square(5))
- ```
- - Error
- - 5
- - 0
- - 25
- # Recursive functions
- ## Q1 & Q2
- ```js
- function recurse_1(param) {
- if (param) {
- return "done";
- } else {
- const not_param = !param
- return recurse_1(not_param);
- }
- }
- ```
- // Q1: what does this return ?
- const ret_val = recurse_1(true);
- // Q2: what does this return ?
- const ret_val = recurse_1(false);
- ## Q3 & Q4
- ```js
- function recurse_2(param) {
- if (param) {
- const not_param = !param
- return recurse_2(not_param);
- } else {
- return "done";
- }
- }
- ```
- // Q1: what does this return ?
- const ret_val = recurse_2(true);
- // Q2: what does this return ?
- const ret_val = recurse_2(false);
- # array.map()
- ## Q1
- ```js
- function divideByTwo(num) {
- return num/2
- }
- let array = [12, 4, 2]
- let result = array.map(divideByTwo)
- console.log(result)
- ```
- - 3
- - [12, 4, 2]
- - [6, 2, 1]
- ## Q2
- ```js
- let books = ['Harry Potter', 'One Piece', 'Midnight Murder']
- function getLength (str='') {
- return str.length
- }
- let result = books.map(getLength)
- console.log(result)
- ```
- - ['', '', '']
- - [12, 9, 15]
- - 3
- - Error
- ## Q3
- ```js
- let fibonacci = [0, 1, 1, 2, 3, 5, 8]
- let result = fibonacci.map((val) => val*-1)
- console.log(result)
- ```
- - [0, 1, 1, 2, 3, 5, 8]
- - [-1, 0, 0, 1, 2, 4, 7]
- - [0, -1, -1, -2, -3, -5, -8]
- ## Q4
- ```js
- let result = [true, false, true, true].map(b => !b)
- console.log(result)
- ```
- - Error
- - [false, true, false, false]
- - [true, false, true, true]
- - [true, true, true, true]
- ## Q5
- ```js
- let result = ['papa', 'mama', 'cat', 'dog'].map(val => 1)
- console.log(result)
- ```
- - Error
- - [1, 1, 1, 1]
- - ['papa', 'mama', 'cat', 'dog']
- # array.filter()
- ## Q1
- ```js
- const fruits = ['apple', 'banana', 'grapes', 'mango', 'orange']
- function getFruitILike(fruit) {
- return fruit.indexOf('n') === -1
- }
- let result = fruits.filter(getFruitILike)
- ```
- ## Q2
- ```js
- const countries = ['EN', 'BE', 'NL', 'JA', 'GA', 'USA']
- function keepLongCountryCode(code) {
- return code.length > 2
- }
- let result = countries.filter(keepLongCountryCode)
- console.log(result)
- ```
- - ['EN', 'BE', 'NL', 'JA', 'GA', 'USA']
- - ['EN', 'BE', 'NL', 'JA', 'GA']
- - ['USA']
- - 'USA'
- ## Q3
- ```js
- let lang = ['golang', 'python', 'C++', 'javascript', 'C', 'ruby']
- let result = lang.filter(lang => lang[0] === 'C')
- console.log(result.length)
- ```
- - ['C++', 'C']
- - 2
- - ['golang', 'python', 'javascript', 'ruby']
- ```
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