Javascript：如何删除数组中字符串内的特定字符值

Question

I am trying to remove punctuation from each string within an array, but this problem would exist for trying to delete any type of character within strings within an array.

I have attempted to create 3 loops: The first loop iterates over each item in arrayA that I'm aiming to edit. The second loop iterates through each character in each string in arrayA. The third loop checks whether the character in arrayA matches any character in arrayB, and deletes it if it does.

Nothing is being deleted however, and I'm not sure why.

This is my code so far:

let arrayA = ['abc', 'def', 'ghi'];
let arrayB = ['a', 'e', 'i', 'o', 'u'];

arrayA.forEach((item) => {
    for (let i=0; i < item.length; i++) {
        for (let arrayBIndex = 0; arrayBIndex < arrayB.length; arrayBIndex++) {
            item.replace(arrayB[arrayBIndex], '');
        };
    };
});
console.log(arrayA);

I have searched for other questions dealing with this, but I haven't been able to find any answers, specifically where the elements to delete are contained in another list. Thank you for your help.

Answer 1

You can generate regular expression using arrayB and then using array#map iterate through each word in arrayA and use string#replace to get rid of words from arrayB .

 let arrayA = ['abc', 'def', 'ghi'], arrayB = ['a', 'e', 'i', 'o', 'u'], regExp = new RegExp(arrayB.join('|'), 'g'), result = arrayA.map(word => word.replace(regExp, '')); console.log(result); 

Answer 2

If you wish to follow with arrays, I would suggest to transform your strings into an array of characters and using array filter operator.

However you can probably achieve what you want to do with regular expressions

  const arrayA = ['abc', 'def', 'ghi']; const arrayB = ['a', 'e', 'i', 'o', 'u']; const result = arrayA .map(s => [...s]) // array of chars .map(chars => chars.filter(ch=>!arrayB.includes(ch)).join(''))//filter out invalid char and transform back into string console.log(result) 

Answer 3

Use Array.prototype.splice() , take a look on this:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

Answer 4

 const result = arrayA.map(item => {
   let replaced = "";
   for(const char of item)
     if(!arrayB.includes(char)) 
        replaced += char;
   return replaced;
});

Strings are immutable. Every mutation returns a new string instead of mutating the original.