Answers for "js combine two array"

combine two arrays javascript

let arr1 = [0, 1, 2];
let arr2 = [3, 5, 7];
let primes = arr1.concat(arr2);

// > [0, 1, 2, 3, 5, 7]

javascript combine array of arrays

/* Flatten (merge) an array of arrays with reduce & concat */
let myArrays = [[1, 2, 3], [4, 5], [6]];
myArrays.reduce((initial, current) => initial.concat(current), []);
// → [1, 2, 3, 4, 5, 6]


/* Join multiple arrays together. */
let warm = ["red", "orange"];
let cool = ["blue", "purple"];
let neutral = ["brown", "gray"];
let colors = warm.concat(cool).concat(neutral);
// → ["red", "orange", "blue", "purple", "brown", "gray"]

concatenate multiple arrays javascript

const array1 = ['a', 'b', 'c'];
const array2 = ['d', 'e', 'f'];
const array3 = [...array1, ...array2];

console.log(array3);
// expected output: Array ["a", "b", "c", "d", "e", "f"]

concat multiple arrays in javascript

const concatArrays = (...arrays) => {
  let concatenatedArray = [];
  for(let i=0; i<arrays.length; i++){
    if(Array.isArray(arrays[i])){
    concatenatedArray.push(...arrays[i]);
  }
  else
  return false;
  }
  return concatenatedArray;
}