CODEWITHSUNDEEP
javascriptarrayslookup
user1717828
user1717828

Reputation: 7223

How to apply lookup to array in Javascript?

How can I apply an array to a lookup dictionary in Javascript? Example:

lookup = {"milk": 1, "water": 2, "soda": 3};
my_array = ["milk", "milk", "water", "milk", "soda"];

my_array.??? // This should give [1, 1, 2, 1, 3]

I've tried my_array.map(lookup) and I get #<Object> is not a function. Same with .filter(), .apply() and the other obvious candidates.

Upvotes: 1

Views: 46

Answers (1)

mickl
mickl

Reputation: 49985

You need array.map() but you have to specify a function which transforms single my_array element:

let lookup = {"milk": 1, "water": 2, "soda": 3};
let my_array = ["milk", "milk", "water", "milk", "soda"];

let result = my_array.map(x => lookup[x]);
console.log(result);

Upvotes: 4

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