I would like to split a very large string (let's say, 10,000 characters) into N-size chunks.
What would be the best way in terms of performance to do this?
For instance:
"1234567890" split by 2 would become ["12", "34", "56", "78", "90"].
Would something like this be possible using String.prototype.match and if so, would that be the best way to do it in terms of performance?
This is a fast and straightforward solution -
function chunkString (str, len) {
const size = Math.ceil(str.length/len)
const r = Array(size)
let offset = 0
for (let i = 0; i < size; i++) {
r[i] = str.substr(offset, len)
offset += len
}
return r
}
console.log(chunkString("helloworld", 3))
// => [ "hel", "low", "orl", "d" ]
// 10,000 char string
const bigString = "helloworld".repeat(1000)
console.time("perf")
const result = chunkString(bigString, 3)
console.timeEnd("perf")
console.log(result)
// => perf: 0.385 ms
// => [ "hel", "low", "orl", "dhe", "llo", "wor", ... ]var str = "123456789";
var chunks = [];
var chunkSize = 2;
while (str) {
if (str.length < chunkSize) {
chunks.push(str);
break;
}
else {
chunks.push(str.substr(0, chunkSize));
str = str.substr(chunkSize);
}
}
alert(chunks); // chunks == 12,34,56,78,9