addPair

An object is a way to collect data and assign a unique label to each item. One example of a real-life object is a dictionary - every word has a corresponding definition. Here's how a dictionary would look as an App Lab object:

var dictionary = {
    "tortilla": "a thin, flat pancake of cornmeal or flour, eaten hot or cold, typically with a savory filling as a part of Mexican cuisine.",
    "naan": "a type of leavened bread, typically of teardrop shape and traditionally cooked in a clay oven as part of Indian cuisine.",
    "injera": "a white leavened Ethiopian bread made from teff flour, similar to a crêpe."
}

In the example above, each word in the dictionary is the key - it's what you use to look up values in the dictionary. The definitions are the values - they are what are trying to look up in the dictionary.

You can add new elements to an object using addPair. You can think of this as a pair of objects because you're adding two things: the key, and the value. In the dictionary example, this is like adding both the word and the definition to the dictionary:

• "crepe": "a thin pancake, used to make sweet or savory dishes. Crepes are common in Vietnamese cuisine"

We could add this to our dictionary with the code:

addPair(dictionary, "crepe", "a thin pancake, used to make sweet or savory dishes. Crepes are common in Vietnamese cuisine")

Examples

Add A Phone Number

Add a new number to a contact list

var phoneNumbers = {
	"Brendan": "520-555-1827",
    "Alicia": "510-555-9182",
    "Omar": "720-555-2817",
    "Emergency": "911"
};

var name = prompt("Enter the new name you want to add to your contact list);
var number = prompt("Enter the new phone number");
addPair(phoneNumbers, name, number);
console.log(name + ": " + number + " was successfully added to your phone numbers");

Abbreviation Dictionary

Teach a chatbot what new abbreviations mean

var abbreviations = {
	"LOL": "Laugh out loud",
    "TIL": "Today I Learned",
    "LGTM": "Looks Good To Me",
    "FWIW": "For What It's Worth",
    "FYI": "For Your Information"
};

console.log("Hello! I am learning new abbreviations! Would you like to look up an abbreviation, or teach me a new one?);
var choice = prompt("(1) Look Up an Abbreviation (2) Teach a New Abbreviation);

if(choice == 1) {
	var word = prompt("What abbreviation do you want to look up?");
    var definition = getValue(abbreviations, word);
    console.log(word + ": " + definition);
}
if(choice == 2) {
	var word = prompt("What is the new abbreviation?");
    var definition = prompt("What does it mean?");
    addPair(abbreviations, word, definition);
    console.log("Successfully Added!");
}

Syntax

addPair(object, key, value)

Returns

None

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