Maybe it's too late in Germany (1:04AM) or maybe I'm missing something...
How can I combine these two arrays:
a = [1, 2, 3] and b = [a, b, c] so that i get: [[1, a], [2, b], [3, c]]
Thank and ... spend more time sleeping! :)
Edit:
I see this function is called "zip". +1 Knowledge
And there is no built-in function in JavaScript for this. +1 Knowledge
And I should have said that the arrays are equal in length. -1 Knowledge
Array.prototype.zip = function(other) {
if (!Array.prototype.isPrototypeOf(other)) {
// Are you lenient?
// return [];
// or strict?
throw new TypeError('Expecting an array dummy!');
}
if (this.length !== other.length) {
// Do you care if some undefined values
// make it into the result?
throw new Error('Must be the same length!');
}
var r = [];
for (var i = 0, length = this.length; i < length; i++) {
r.push([this[i], other[i]]);
}
return r;
}
Assuming both are equal in length:
var c = [];
for (var i = 0; i < a.length; i++) {
c.push([a[i], b[i]]);
}
You might want to check underscore.js which contains lots of needed utility function. In your case function *_.zip()*
_.zip([1, 2, 3], [a, b, c]);
results as:
[[1, a], [2, b], [3, c]]
In ES6, we can use .map() method to zip both arrays (assuming both arrays are equal in length):
let a = [1, 2, 3],
b = ['a', 'b', 'c'];
let zip = (a1, a2) => a1.map((v, i) => [v, a2[i]]);
console.log(zip(a, b));.as-console-wrapper { max-height: 100% !important; top: 0; }