Maps - Javascript 1. Setting up a map of keys(english) and their associated values (translation ) 2. Test of myTranslation returns a Object, with associated k|v pairs 3. Looping through . We setup our variables, the sentry var, the key a blank string, and keys an array. 4. We assign the keys array var the Object.Keys funciton and pass in the map…

Maps - Javascript.js

//1. Creating a Map, and looping though it.  
//Create a map, a collection of key value pairs
var myTranslation = { 
    "my house": "mein Haus", 
    "my boat": "mein Boot", 
    "my horse": "mein Pferd"
}

// quick console test..
myTranslation
Object {my house: "mein Haus", my boat: "mein Boot", my horse: "mein Pferd"}

//Loop through all keys logic.  
var i=0, key="", keys=[];
keys = Object.keys( myTranslation);
for (i=0; i < keys.length; i++) {
  key = keys[i];
  alert('The translation of '+ key +' is '+ myTranslation[key]);
}

//2.  Adding a value 
// SYN : 		• Mapname | ["Key"] = "value";
myTranslation["my car"] = "mein Auto";

//3.  Delete
//Delete a Map Entry   :  simply cite the key with the delete operator.
delete myTranslation["my boat"];

//4.  Search for an element within the array  
if ("my horse" in myTranslation) { 
console.log("true") 
} else { 
console.log("false") 
} 
// true

if ("my pencil" in myTranslation) { 
console.log("true") 
} else { 
console.log("false") 
} 
// false