使用JavaScript在逗号分隔的字符串中查找新值

Question

I have an array

       obj = ["30890560", "29092960", "28652336", "28642195", "26512957", "26190575", "25465297", "25144372", "23579449"]

and I need to compare it to a comma separated string

     "29092960,28652336,28642195,26512957,26190575,25465297,25144372"

is there a way for me to end up with an new comma separated string such as

       let newList = "30890560,23579449"

The array will always have more values then the string for the comparison. This needs to be done using JavaScript inside a Vue.js page so no jQuery.

Do I need to split the comma separated string and compare each value in the array?

something like

        ["30890560", "29092960", "28652336", "28642195", "26512957", "26190575", "25465297", "25144372", "23579449"].includes('30890560');

Would a create a loop looking for a false value? I would need some help to structure the loop. Thanks

Answer 1

 const arr1 = ["30890560", "29092960", "28652336", "28642195", "26512957", "26190575", "25465297", "25144372", "23579449"]; const str = "29092960,28652336,28642195,26512957,26190575,25465297,25144372"; const arr2 = str.split(','); // Convert CSV String to array const res = arr1.filter(v => !arr2.includes(v)); console.log(res) 

String/split ^_MDN
Array/filter ^_MDN
Array/includes ^_MDN

Answer 2

You can JavaScript's split() method to separate the string into an array of strings. And then compare both the arrays.

 var obj = ["30890560", "29092960", "28652336", "28642195", "26512957", "26190575", "25465297", "25144372", "23579449"]; var str = "29092960,28652336,28642195,26512957,26190575,25465297,25144372"; var list = str.split(','); console.log(list); // Loop over two arrays to compare their equality. for (let i = 0; i < list.length; i++) { if (list[i] !== obj[i]) { // Do something. } } 

Answer 3

You can use split, set and filter

 const arr1 = ["30890560", "29092960", "28652336", "28642195", "26512957", "26190575", "25465297", "25144372", "23579449"] const str = "29092960,28652336,28642195,26512957,26190575,25465297,25144372" const arr2 = new Set(str.split(',')) const output = arr1.filter(v => !arr2.has(v)); console.log(output)