三元条件下的多个 OR 运算符，

Question

I'm trying to create a new string by checking the value of a character and replacing it based on the true or false evaluation from the ternary operator.

I have had success using only a single character and from what I have read it is possible to have a ternary operator condition include the || or operator. I have tried using only two and it's not producing the correct result.

Is it because once the condition is met is wont go past || or operator?

How much can ternary conditions contain and would it work better to put conditions into a variable or function?

I'm aware the problem can be solved differently but I am experimenting with the ternary operator to gain a better understanding.

Thanks in advance, I'm new to JavsScript.

.

 let input = 'President Donald Trump signed an executive order on Friday aimed at preventing counterfeit products from abroad from being sold to US citizens who shop online using Amazon.com, Walmart.com or other e-commerce websites, the White House said.' const vowels = ['a', 'e', 'i', 'o', 'u'] const ranNum = () => {return Math.floor(Math.random() * 5)} let news = '' const swapper = input => { let count = 0 while (count != input.length) { let cond = input[count].toLowerCase() cond != ' ' || cond != 'a' ? news += vowels[ranNum()] : news += input[count] count ++ } console.log(news) } console.log(input) swapper(input) //c != 'a' || c != 'e' || c != 'i' || c != 'o' || c != 'u'

Answer 1

The problem is

cond != ' ' || cond != 'a' ? (...)

This condition will always be true - if cond is a space, it will fulfill cond != 'a' . If cond is 'a' , it will fulfill cond != ' ' . If cond is anything else, it will fulfill cond != ' ' .

Instead use:

(cond === ' ' || cond === 'a') ? news += input[count] : news += vowels[ranNum()];

 let input = 'President Donald Trump signed an executive order on Friday aimed at preventing counterfeit products from abroad from being sold to US citizens who shop online using Amazon.com , Walmart.com or other ecommerce websites, the White House said.' const vowels = ['a', 'e', 'i', 'o', 'u'] const ranNum = () => {return Math.floor(Math.random() * 5)} let news = '' const swapper = input => { let count = 0 while (count != input.length) { let cond = input[count].toLowerCase(); (cond === ' ' || cond === 'a') ? news += input[count] : news += vowels[ranNum()]; count ++ } console.log(news) } console.log(input) swapper(input) //c != 'a' || c != 'e' || c != 'i' || c != 'o' || c != 'u'

That said, you really really shouldn't abuse the conditional operator as a replacement for if - else :

 let input = 'President Donald Trump signed an executive order on Friday aimed at preventing counterfeit products from abroad from being sold to US citizens who shop online using Amazon.com , Walmart.com or other ecommerce websites, the White House said.' const vowels = ['a', 'e', 'i', 'o', 'u'] const ranNum = () => { return Math.floor(Math.random() * 5) } let news = '' const swapper = input => { let count = 0 while (count != input.length) { let cond = input[count].toLowerCase(); if (cond === ' ' || cond === 'a') { news += input[count] } else { news += vowels[ranNum()]; } count++ } console.log(news) } console.log(input) swapper(input)

If you want to use the conditional operator here, you should do it after the news += part:

news += (cond === ' ' || cond === 'a') ? input[count] : vowels[ranNum()];

 let input = 'President Donald Trump signed an executive order on Friday aimed at preventing counterfeit products from abroad from being sold to US citizens who shop online using Amazon.com , Walmart.com or other ecommerce websites, the White House said.' const vowels = ['a', 'e', 'i', 'o', 'u'] const ranNum = () => { return Math.floor(Math.random() * 5) } let news = '' const swapper = input => { let count = 0 while (count != input.length) { let cond = input[count].toLowerCase(); news += (cond === ' ' || cond === 'a') ? input[count] : vowels[ranNum()]; count++ } console.log(news) } console.log(input) swapper(input)

It might be clearer to use an array when there are multiple values to check (especially if you plan on having more than 2 checks eventually):

 let input = 'President Donald Trump signed an executive order on Friday aimed at preventing counterfeit products from abroad from being sold to US citizens who shop online using Amazon.com , Walmart.com or other ecommerce websites, the White House said.' const vowels = ['a', 'e', 'i', 'o', 'u'] const ranNum = () => { return Math.floor(Math.random() * 5) } let news = '' const swapper = input => { let count = 0 while (count != input.length) { let cond = input[count].toLowerCase(); news += [' ', 'a'].includes(cond) ? input[count] : vowels[ranNum()]; count++ } console.log(news) } console.log(input) swapper(input)