CODEWITHSUNDEEP
javascriptarraysstringmultidimensional-array
Mark Hkr
Mark Hkr

Reputation: 710

Javascript - How to concatenate string values from two arrays of different sizes?

I have two arrays, for example:

Array1:

arr1 = ["Precon", "Contra", "Postco", "Cancel", "Consul"]

Array2:

arr2 = ["EJID", "EMBA", "EMPR", "GOBI", "PART", "PPOL", "SACI", "SOFL", "SOFM", "0000", "", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009", "0010", "0011", "0012", "0013", "0014", "0015", "0016", "011", "0110", "9999"]

I want to generate a new array from two above concatenating the individual items into new items recursively for each one in array1, to get a final array like this:

final = ['Precon-EJID', 'Contra-EJID', 'Postco-EJID', 'Cancel-EJID', 'Consul-EJID', 'Precon-EMBA', 'Contra-EMBA', 'Postco-EMBA', 'Cancel-EMBA', 'Consul-EMBA', 'Precon-EMPR', 'Contra-EMPR', 'Postco-EMPR', 'Cancel-EMPR', 'Consul-EMPR'...etc]

Thank you in advance

Upvotes: 0

Views: 293

Answers (6)

Jimenemex
Jimenemex

Reputation: 3166

Here's a recursive one. Just like the OP asked. Took me a while. :P

arr1 = ["Precon", "Contra", "Postco", "Cancel", "Consul"]

arr2 = ["EJID", "EMBA", "EMPR", "GOBI", "PART", "PPOL", "SACI", "SOFL", "SOFM", "0000", "", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009", "0010", "0011", "0012", "0013", "0014", "0015", "0016", "011", "0110", "9999"]

var arr = [];

console.log(concat(arr1, arr2, 0, 0, 0));

function concat(arr1, arr2, arrIndex, index1, index2) {
  //console.log(arr1.length);
  if (index2 === (arr2.length)) {
    return;
  } else {
    arr[arrIndex] = arr1[index1] + '-' + arr2[index2];
    if (index1 !== (arr1.length - 1)) {
      index1++;
    } else if (index1 === (arr1.length - 1)) {
      index1 = 0;
      index2++;
      //concat(arr1, arr2, ++arrIndex, index1, index2++); // Not here dummy :P
    }
    concat(arr1, arr2, ++arrIndex, index1, index2++);
  }
  return arr;
}

Upvotes: 0

Get Off My Lawn
Get Off My Lawn

Reputation: 36299

Another option is to use reduce...

let arr1 = ["Precon", "Contra", "Postco", "Cancel", "Consul"]

let arr2 = ["EJID", "EMBA", "EMPR", "GOBI", "PART", "PPOL", "SACI", "SOFL", "SOFM", "0000", "", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009", "0010", "0011", "0012", "0013", "0014", "0015", "0016", "011", "0110", "9999"]

let arr3 = arr2.reduce((arr, val) => {
    let f = []
    arr1.forEach(itm => val && f.push(itm + '-' + val))
    return arr.concat(f)
}, [])

console.log(arr3)

Upvotes: 0

Aluan Haddad
Aluan Haddad

Reputation: 31803

const prefixes = [
  "Precon",
  "Contra",
  "Postco",
  "Cancel",
  "Consul"
];

const suffixes = [
  "EJID", "EMBA", "EMPR",
  "GOBI", "PART", "PPOL",
  "SACI", "SOFL", "SOFM",
  "0000", "", "0002",
  "0003", "0004", "0005",
  "0006", "0007", "0008",
  "0009", "0010", "0011",
  "0012", "0013", "0014",
  "0015", "0016", "011",
  "0110", "9999"
];

const results = suffixes
  .map(suffix => prefixes.map(prefix => prefix + '-' + suffix))
  .reduce((xs, ys) => [...xs, ...ys]);

console.log(results);

Upvotes: 0

CRice
CRice

Reputation: 32146

Here's a one liner to do this:

arr1 = ["Precon", "Contra", "Postco", "Cancel", "Consul"]
arr2 = ["EJID", "EMBA", "EMPR", "GOBI", "PART", "PPOL", "SACI", "SOFL", "SOFM", "0000", "", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009", "0010", "0011", "0012", "0013", "0014", "0015", "0016", "011", "0110", "9999"]

const result = [].concat(...arr1.map(prefix => arr2.map(suffix => prefix+suffix)));
console.log(result)

// EDIT: if order matters, reverse the use of arr1 and arr2:

const orderedResult = [].concat(...arr2.map(suffix => arr1.map(prefix => prefix+suffix)));
console.log(orderedResult)

Upvotes: 0

Ori Drori
Ori Drori

Reputation: 191946

You can use nested Array#map calls, and flatten the results using Array#concat:

const arr1 = ["Precon", "Contra", "Postco", "Cancel", "Consul"]

const arr2 = ["EJID", "EMBA", "EMPR", "GOBI", "PART", "PPOL", "SACI", "SOFL", "SOFM", "0000", "", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009", "0010", "0011", "0012", "0013", "0014", "0015", "0016", "011", "0110", "9999"]

const result = [].concat(...arr2.map((s1) => arr1.map((s2) => `${s2}-${s1}`)))

console.log(result)

Upvotes: 2

Blue
Blue

Reputation: 22911

You can do this with 2 simple for of loops:

var arr1 = ["Precon", "Contra", "Postco", "Cancel", "Consul"];

var arr2 = ["EJID", "EMBA", "EMPR", "GOBI", "PART", "PPOL", "SACI", "SOFL", "SOFM", "0000", "", "0002", "0003", "0004", "0005", "0006", "0007", "0008", "0009", "0010", "0011", "0012", "0013", "0014", "0015", "0016", "011", "0110", "9999"]

var finalArr = [];

for ( var item2 of arr2 ) {
  for ( var item1 of arr1 ) {
    finalArr.push(`${item1}-${item2}`);
  }
}

console.log(finalArr);

Upvotes: 4

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