I am currently working on a project that involves two arrays and I need to merge or join them in order to display the output in a table.
var array1 = ["a","b"];
var array2 = ["x", "y"];
While I am aware of methods like concat and push, I haven't been able to find a method that fits my specific needs, as concat simply adds to the array without the desired output.
The result I'm expecting is
var combinedarray = ["x and a","y and b"];
If you want to retrieve values from two arrays simultaneously, you can utilize the `map` function along with the index argument in the callback function. This way, you can easily access corresponding values from both arrays:
var arr1 = ["apple","banana"];
var arr2 = ["red", "yellow"];
var result = arr1.map((item,index) => `${item} is ${arr2[index]}`);
console.log(result);If you need to combine two arrays, a for loop can be used in the following manner:
var array1 = ["apple","banana"];
var array2 = ["red", "yellow"];
var combinedarray = [];
for (i=0; i < array1.length; i++) {
combinedarray.push(array1[i] + " is " + array2[i]);
}
console.log(combinedarray);An alternative method, suggested by @trincot, is utilizing the map() function for a more concise solution.
To create a readable string, you can transpose the array and then join the elements together later.
var array1 = ["a","b"],
array2 = ["x", "y"],
result = [array1, array2]
.reduce((r, a) => a.map((v, i) => [...(r[i] || []), v]), [])
.map(a => a.concat(a.splice(-2, 2).join(' and ')).join(', '))
console.log(result);Here is an example using three arrays:
var array1 = ["a","b"],
array2 = ["x", "y"],
array3 = ["1", "2"],
result = [array1, array2, array3]
.reduce((r, a) => a.map((v, i) => [...(r[i] || []), v]), [])
.map(a => a.concat(a.splice(-2, 2).join(' and ')).join(', '))
console.log(result);Here is a way to use the reduce() method with array2:
var array1 = ["a","b"];
var array2 = ["x", "y", "z"];
let result = array2.reduce(
(accumulator, element, index) => accumulator.push(element + " and " + (array1[index] || "?")) && accumulator,
[]
);
console.log(result);You can also make this code more concise by using the spread operator:
var array1 = ["a","b"];
var array2 = ["x", "y", "z"];
let result = array2.reduce((accumulator, element, index) => [...accumulator, element + " and " + (array1[index] || "?")], []);
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