I am looking at trying to implement the map function myself.
So far my code looks like this:
Array.prototype.mapz = function (callback) {
let arr = []
for (let i = 0; i < array.length; i++) {
arr.push(callback(array[i]));
}
return arr;
};
function double(arg) {
return arg * 2
};
const x = [1, 2, 3].mapz(double);
console.log(x); // This should be [2, 3, 6];I am wondering how I can get access to the array I am mapping over in my mapz method?
You could access with this.
Array.prototype.mapz = function (callback) {
let arr = [];
for (let i = 0; i < this.length; i++) {
arr.push(callback(this[i]));
}
return arr;
};
function double(arg) {
return arg * 2;
}
const x = [1, 2, 3].mapz(double);
console.log(x);
Use the this keywork to access the array inside your function:
Array.prototype.mapz = function(callback) {
const arr = []
for (let i = 0; i < this.length; i++) {
arr.push(callback(this[i]));
}
return arr;
};
const x = [1, 2, 3].mapz(value => value * 2);
console.log(x);You can simply use this
Array.prototype.mapz = function (callback) {
let arr = []
for (let i = 0; i < this.length; i++) {
arr.push(callback(this[i]));
}
return arr;
};You can use this keyword to access the array
Array.prototype.mapz = function (callback) {
let arr = []
for (let i = 0; i < this.length; i++) {
arr.push(callback(this[i]));
}
return arr;
};
function double(arg) {
return arg * 2
};
const x = [1, 2, 3,5].mapz(double);
console.log(x)