This are my two data arrays:
var array1 = ["test","test1","test2"];
var array2 = ["test3","test4","test5"];
I need to concact the array to get the following result:
array3["test","test3","test1","test4","test2","test5"]
How can I archive this?
Considering, both arrays can have different number of elements
var array1 = ["test","test1","test2"];
var array2 = ["test3","test4","test5"];
var maxLength = Math.max(array1.length, array2.length)
var array3 = [];
for (var index=0; index < maxLength; index++) {
if (index < array1.length)
array3.push(array1[index]);
if (index < array2.length)
array3.push(array2[index]);
}
console.log(array3);
You could transose the arrays and flat the result.
var array1 = ["test", "test1", "test2"],
array2 = ["test3", "test4", "test5"],
result = [array1, array2]
.reduce((r, a) => a.map((v, i) => [...(r[i] || []), v]), [])
.reduce((a, b) => a.concat(b));
console.log(result);I would recommend array.reduce() to achieve this concisely.
let array1 = ["test", "test1", "test2"];
let array2 = ["test3", "test4", "test5"];
const weaveArrays = (array1, array2) => {
// Only allow arrays of same length
if (array1.length === array2.length) {
return array1.reduce((acc, v, i) => {
acc.push(v, array2[i]);
return acc;
}, []);
} else {
console.warn('Arrays passed to "weaveArrays" must be of equal length');
return [];
}
}
console.log(weaveArrays(array1, array2));
You can find the minimal length, the process the element with index less minimal length, then attach the element from the minimal length index.
var array1 = ["test","test1","test2","test6"];
var array2 = ["test3","test4","test5"];
var array1_length = array1.length;
var array2_length = array2.length;
var minLength = Math.min(array1_length,array2_length);
var result = [];
for (var index=0; index < minLength; index++){
result.push(array1[index]);
result.push(array2[index]);
}
if(array1_length > array2_length){
result = result.concat(array1.slice(index));
}
if(array2_length > array2_length){
result = result.concat(array2.slice(index));
}
console.log(result);