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- //assign: evaluation
- var a = 5;
- var b, c;
- //if we delete brackets functionality is same
- // b = (a * 5);
- // b = (c = b/2);
- // a = 5
- // b = 12,5
- // c = 12,5
- //one line variant
- c = b = (a * 5) / 2;
- // forgot one semicolon!
- // for(let i = 0 i < 5; i++) {
- // console.log(i)
- // }
- // wrong usage of semicolon
- //let a; b = 5;
- //b = 5 c = b + 1;
- //semicolon logic errors
- // if(a === 5) {
- // console.log('FIVE!')
- // }else; console.log('not five(')
- //GET YEAR TASK:
- function getAge(age, currentYear = new Date().getFullYear()) {
- try {
- age = Math.trunc(Number(age))
- if(!age || isNaN(age) || age > 200 || age < 0) {
- throw e
- } else {
- currentYear = currentYear - age
- return [currentYear, currentYear-1]
- }
- } catch(e) {
- return 0
- }
- }
- let year = getAge(prompt("input your age",""))
- if(year) {
- alert(`Looks like you've been born in ${year[0]} or ${year[1]}`)
- } else {
- alert('whoops, looks like invalid input value has been given!')
- }
- //GET TEMPERATURE TASK:
- try {
- let grad = Number(prompt("Input temperature",""))
- let sys = prompt(`
- Type:
- F - to translate to Fahrenheit
- C - to translate to Celsius
- `)
- let res = getTemperature(grad, sys)
- if(res) {
- alert(`${grad}${sys.toLowerCase() === 'c'? '°F':'°C'} = ${res}${sys.toLowerCase() === 'c'? '°C':'°F'}`)
- } else {
- throw e;
- }
- } catch(e) {
- alert('invalid input!')
- }
- function getTemperature(value, system="c") {
- if(isNaN(Number(value))) return false
- switch(system.toLowerCase()) {
- case 'f':
- return ((value * 9/5) + 32).toFixed(2)
- case 'c':
- return ((value - 32) * 5/9).toFixed(2)
- default:
- return false
- }
- }
- //divide using floor
- function flooredDivide(num1, num2) {
- console.log(num1 / num2)
- return Math.floor(num1 / num2)
- }
- //infor user if number given is odd task
- function oddInformer() {
- let num = prompt("input a number:", "")
- if(isNaN(+num) || !num) {
- alert("not a number!!!")
- } else {
- if(num % 2 !== 0) {
- alert(`${num} is odd`)
- } else {
- alert(`${num} is even`)
- }
- }
- }
- oddInformer()
- //greet user using alert() and prompt()
- function greeting() {
- let name = prompt("Hey user, what's your name")
- alert(`Hello, ${name? name : 'Namless One...'}`)
- }
- greeting()
- //check if text contains desired words
- function lexis(string, word) {
- if(string.indexOf(word) > 0) {
- return true
- } else {
- return false
- }
- }
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