Split array (uneven chunks) when item value ends with " ago"

I need to split array that chunks are uneven unfortunately, however I know that every new array ends with item that has ago(space ago) in the value.

const arrExample = ["Blah","559","86,758","4.05","2.38","-4.48%","-0.44%","13,562","30d ago", "Trall","531","210,676","16","15","-3.8%","4,955","403d ago", "Shibu","506","991,748","84","6.71%","5,897","667d ago", "Mommy","404","35,083","1.64","1.64","-8.38%","17%","7,378","323d ago","Rocket","403","274",".4088",".355","-","-","483","47h ago"...]

>Solution :

Just iterate through your input array, test for your substring, and push array slices into your output array.

const input = ["Blah","559","86,758","4.05","2.38","-4.48%","-0.44%","13,562","30d ago", "Trall","531","210,676","16","15","-3.8%","4,955","403d ago", "Shibu","506","991,748","84","6.71%","5,897","667d ago", "Mommy","404","35,083","1.64","1.64","-8.38%","17%","7,378","323d ago","Rocket","403","274",".4088",".355","-","-","483","47h ago"];
const output = [];
const n = input.length; // cache length
for (let i = 0, x = 0; i < n; i++) {
  if (input[i].endsWith(" ago")) {
    output.push(input.slice(x, i + 1)); // push the entire chunk
    x = i + 1;
  }
}
console.log(output);

Note: slicing and pushing the entire chunk should be more efficient than pushing individual values… with the efficiency scaling with your input/chunk size.