如何将字符串数组的元素转换为在 javascript 中以单引号和逗号分隔元素的字符串

Question

I have an array like this

      arr=["japan","china","india"];

i want to convert it into a string like this

      str="'japan','china','india'"

join() wouldnt fullfill my requirement as it gives result like below..

      str="japan,china,india"

Any help pls....

Answer 1

Use reduce and continue adding to the accumulator.

let res = arr.reduce((acc,curr,ind) => acc += (ind == arr.length -1) ? `'${curr}'` :`'${curr}',` ,'')

Answer 2

When declaring variables always use var or let :

let arr = ["japan","china","india"];
let str = arr.map(x => "'" + x + "'").join(); // 'japan','china','india'

Answer 3

Yop,

You can use something like this:

['japan', 'china', 'india'].map(country => `'${country}'`).toString();
// output: 'japan','china','india'

The.map will quote each element of your array, then the.toString will join all the array elements (you can use.join instead if you want another seperator between your elements).

Answer 4

arr.reduce((acc,val, index) => {
if (index === 0 ) { 
acc = acc + `'${val}'`
} else {
acc = acc + `, '${val}'`
}
return acc;
},'');

Answer 5

Try this:

<script>
            let arr = ["japan", "china", "india"];
            let str = '';
            for (let i = 0; i < arr.length; i++) {
                if (i < arr.length-1)
                    str += "\'" + arr[i] + "\'" + ",";
                else
                    str += "\'" + arr[i] + "\'";
            }
            console.log(str);
</script>