hoangdev72
3 years ago
parent
1b771fb6d6
commit
4e58a20337
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<script>
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const countries = [
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'Albania',
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'Bolivia',
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'Canada',
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'Denmark',
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'Ethiopia',
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'Finland',
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'Germany',
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'Hungary',
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'Ireland',
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'Japan',
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'Kenya'
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]
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const webTechs = [
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'HTML',
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'CSS',
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'JavaScript',
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'React',
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'Redux',
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'Node',
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'MongoDB'
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]
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// Declare an empty array;
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let emptyArr = new Array()
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// Declare an array with more than 5 number of elements
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let arrayOf5Elements = Array(1, 2, 3, 4, 5)
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// Find the length of your array
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console.log(arrayOf5Elements.length)
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// Get the first item, the middle item and the last item of the array
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console.log(arrayOf5Elements[0], arrayOf5Elements[parseInt(arrayOf5Elements.length/2)], arrayOf5Elements[arrayOf5Elements.length - 1])
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// Declare an array called mixedDataTypes, put different data types in the array and find the length of the array. The array size should be greater than 5
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let mixedDataTypes = [1, "hello", true, Array(), NaN]
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console.log(mixedDataTypes.length)
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// Declare an array variable name itCompanies and assign initial values Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon
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let itCompanies = ["Facebook", "Google", "Microsoft", "Apple", "IBM", "Oracle", "Amazon"]
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// Print the array using console.log()
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console.log(itCompanies)
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// Print the number of companies in the array
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console.log(itCompanies.length)
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// Print out each company
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console.log(itCompanies.join(' '))
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console.log(itCompanies.toString())
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// Change each company name to uppercase one by one and print them out
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console.log(itCompanies.map(e => e.toUpperCase()).toString())
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// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
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console.log(itCompanies.join(", "))
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// Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
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let cpn = "Facebook"
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if(itCompanies.includes(cpn)){
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console.log(`${cpn} exists`)
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}else{
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console.log(`${cpn} not exists`)
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}
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// Filter out companies which have more than one 'o' without the filter method
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console.log(itCompanies.filter(e => e.includes("o")).toString())
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// Sort the array using sort() method
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console.log(itCompanies.sort().toString())
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// Reverse the array using reverse() method
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console.log(itCompanies.sort().reverse().toString())
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// Slice out the first 3 companies from the array
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console.log(itCompanies.slice(0, 3))
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// Slice out the last 3 companies from the array
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console.log(itCompanies.slice(-3))
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// Slice out the middle IT company or companies from the array
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console.log(itCompanies.slice(parseInt(itCompanies.length/2), parseInt(itCompanies.length/2) +1 ))
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// Remove the first IT company from the array
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console.log(itCompanies.splice(0, 1))
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// Remove the middle IT company or companies from the array
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console.log(itCompanies.splice(parseInt(itCompanies.length/2), 1))
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// Remove the last IT company from the array
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console.log(itCompanies.splice(-1))
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// Remove all IT companies
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console.log(itCompanies.splice())
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// In the following shopping cart add, remove, edit items
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const shoppingCart = ['Milk', 'Coffee', 'Tea', 'Honey']
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console.log(shoppingCart.filter(e => e != 'Milk'))
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console.log(shoppingCart.shift())
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shoppingCart.unshift('Orange')
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console.log(shoppingCart)
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console.log(shoppingCart.filter(e => e != 'Honey'))
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// modify Tea to 'Green Tea'
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console.log(shoppingCart.map((e) => {
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return e == 'Tea' ? 'Green Tea' : e
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}))
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// In countries array check if 'Ethiopia' exists in the array if it exists print 'ETHIOPIA'. If it does not exist add to the countries list.
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countries.includes('ETHIOPIA') ? countries : countries.push('ETHIOPIA')
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console.log(countries)
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const frontEnd = ['HTML', 'CSS', 'JS', 'React', 'Redux']
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const backEnd = ['Node','Express', 'MongoDB']
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console.log(fullStack = frontEnd.concat(backEnd))
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const ages = [19, 22, 19, 24, 20, 25, 26, 24, 25, 24]
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// Sort the array and find the min and max age
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console.log(ages.sort().slice(0, 1))
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console.log(ages.sort().slice(-1))
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// Find the median age(one middle item or two middle items divided by two)
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console.log(ages.sort().slice(parseInt(ages.length / 2), parseInt(ages.length / 2) +1 ) / 2)
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// Find the average age(all items divided by number of items)
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console.log(parseInt(ages.reduce((previousValue, currentValue) => previousValue + currentValue , 0) / ages.length))
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// Divide the countries array into two equal arrays if it is even. If countries array is not even , one more country for the first half.
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countries.pop()
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if (countries.length % 2 == 0){
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console.log(countries.slice(0, countries.length / 2), countries.slice(countries.length / 2, countries.length))
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}else{
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console.log(countries.slice(0, (countries.length / 2) +1), countries.slice((countries.length / 2) + 1, countries.length))
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}
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</script>
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</body>
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</html>
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