Hello I am beginner in learning JavaScript.
I have the code of adding items to a list, but I want now to detect the duplicated items and delete it from the list.
I have tried to create a function at the beginning of my code and call it inside the code block of the (do-while loop). But it did ot work.
I hope someone can help me in doing this.
const readline = require('readline-sync')
const items = []
/*var input = []*/
function checkingTheArray (input, item, items){
if (input.indexOf(item) === -1){
input.indexOf(item)
}
else if (input.indexOf(item) > -1){
console.log(item + `already exist in the list`)
}
}
do {
var input = String(readline.question('enter command: ')).trim()
if (input.indexOf('add ') === 0) {
const space = input.indexOf(' ')
const item = input.substring(space).trim()
console.log(`adding "${item}"`)
items.unshift(item)
}
if (input.indexOf('list') === 0) {
for (let i=0; i< items.length; i++) {
console.log(`${i}. ${items[i]}`)
checkingTheArray(input) /*calling the function*/
}
}
} while (input !== 'exit')
