Question 195497 in Javascript Question posted in
A very good W3school tutorial can be found here.

is there a way to replace a string with seqencial numbers in javascript

say a I have a var like

var str = 'the @ brown @ fox @ jumped @ over @ the @ fence'

can I replace it with

var str = 'the 1 brown 2 fox 3 jumped 4 over 5 the 6 fence'

maybe array.from can help

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4

Answers


  1. Chosen as BEST ANSWER
    0 
    'the @ brown @ fox @ jumped @ over @ the @ fence'
.split('@')
.reduce((acc,cur,i,s)=> `${acc+cur}${(i+1)!==s.length?`$${i+1}`:''}`,'')

  2. 0

    You can use String#replace with a callback that keeps track of the count.

    let str = 'the @ brown @ fox @ jumped @ over @ the @ fence';
let i = 0, res = str.replace(/@/g, () => ++i);
console.log(res);

    Or, similarly with String#replaceAll:

    let str = 'the @ brown @ fox @ jumped @ over @ the @ fence';
let i = 0, res = str.replaceAll('@', () => ++i);
console.log(res);
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  3. 0

    Regex approach:

    using replace with i which is gonna be incremented each time find character @:

    let str = 'the @ brown @ fox @ jumped @ over @ the @ fence';
let i=0;
console.log(str.replace(/@/g, _ => ++i))

    for-loop approach

    let str = 'the @ brown @ fox @ jumped @ over @ the @ fence';
let arr = str.split('@');//[ "the ", " brown ", " fox ", " jumped ", " over ", " the ", " fence" ]
let result = arr[0];
for (let i = 1; i < arr.length; i++) {
  result += i + arr[i];
}
console.log(result)

    reduce approach:

    let str = 'the @ brown @ fox @ jumped @ over @ the @ fence';
let arr = str.split('@');
console.log(arr
  .reduce((acc, curr, i) =>
    acc + (i !== 0 ? i : '') + curr, ''))
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  4. 0

    You could take a closure with a start value of one for the index.

    const
    str = 'the @ brown @ fox @ jumped @ over @ the @ fence',
    result = str.replace(/@/g, (i => _ => i++)(1));

console.log(result);
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