I have the following object:
{
apple: 0,
banana: 0,
cherry: 0,
date: 0,
and so on...
}
And an array of strings that are words from a cookery book.
[0] => "the"
[1] => "apple"
[2] => "and"
[3] => "cherry"
and so on...
I would like to iterate over the array of strings and add +1 every time the above keys are mentioned as a string? I've been trying to use object.keys however have been unable to get it working?
This is in node.js.
You can do something nice and simple like this, which will increment absolutely all keys from the array of strings:
let ingredients = {
apple: 0,
banana: 0,
cherry: 0,
date: 0,
// and more...
}
let arr = ["the","apple","and","cherry"]
// loop through array, incrementing keys found
arr.forEach((ingredient) => {
if (ingredients[ingredient]) ingredients[ingredient] += 1;
else ingredients[ingredient] = 1
})
console.log(ingredients)However, if you want to only increment keys in the ingredients object that you set, you can do this:
let ingredients = {
apple: 0,
banana: 0,
cherry: 0,
date: 0,
// and more...
}
let arr = ["the","apple","and","cherry"]
// loop through array, incrementing keys found
arr.forEach((ingredient) => {
if (ingredients[ingredient] !== undefined)
ingredients[ingredient] += 1;
})
console.log(ingredients)
You can simplify it using reduce.
const words = ["the", "apple", "and", "cherry"];
let conts = {
apple: 0,
banana: 0,
cherry: 0,
date: 0,
};
const result = words.reduce((map, word) => {
if (typeof map[word] !== "undefined") map[word] += 1;
return map;
}, conts);
console.log(result);Another way to handle it using array filter and some:
var fruits = {
apple: 0,
banana: 0,
cherry: 0,
date: 0,
};
const words = ["the", "apple", "and", "cherry"];
var filtered = words.filter(word => Object.keys(fruits).includes(word));
filtered.forEach(fruit => fruits[fruit] += 1);
// fruits
// {apple: 1, banana: 0, cherry: 1, date: 0}
console.log(fruits);