I need a function that removes all instances of a specific substring from a string, except for the first one. For example:
function keepFirst(str, substr) { ... }
keepFirst("This $ is some text $.", "$");
The expected result should be: This $ is some text .
I could achieve this by using split() followed by a for(){} loop, but I'm wondering if there's a more elegant solution available.
Here is a concise and efficient code snippet that utilizes the power of destructuring assignment.
function extractFirstString(str, target) {
const [
firstVal,
...remaining
] = str.split(target);
return firstVal + (remaining.length
? target + remaining.join("")
: "");
}
This code snippet helps in identifying the position of the first instance of a specified character and then removes all subsequent occurrences of that character.
console.log(keepFirst("This $ is some text $$ with $ signs.", "$"));
function keepFirst(str, rep) {
var fInd = str.indexOf(rep);
var first = str.substring(0, fInd + rep.length);
var rest = str.substring(fInd + rep.length);
return first + rest.replace(
new RegExp(rep.replace(/[.*+?^${}()|[\]\\]/g, "\\$&"), 'g'),
'');
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