This function removes duplicate values from an array by returning a new one. function removeDuplicatesBy(keyFn, array) { var mySet = new Set(); return array.filter(function(x) { var key = keyFn(x), isNew = !mySet.has(key); if (isNew) mySet.add(key); return isNew; }); } var values = [{color: “red”}, {color: “blue”}, {color: “red”, number: 2}]; var withoutDuplicates = removeDuplicatesBy(x => … Read more
Beware of properties inherited from the object’s prototype (which could happen if you’re including any libraries on your page, such as older versions of Prototype). You can check for this by using the object’s hasOwnProperty() method. This is generally a good idea when using for…in loops: var user = {}; function setUsers(data) { for (var … Read more
for (NSString* key in xyz) { id value = xyz[key]; // do stuff } This works for every class that conforms to the NSFastEnumeration protocol (available on 10.5+ and iOS), though NSDictionary is one of the few collections which lets you enumerate keys instead of values. I suggest you read about fast enumeration in the … Read more
You can do it like this: #Just an example how the dictionary may look like myDict = {‘age’: [’12’], ‘address’: [’34 Main Street, 212 First Avenue’], ‘firstName’: [‘Alan’, ‘Mary-Ann’], ‘lastName’: [‘Stone’, ‘Lee’]} def search(values, searchFor): for k in values: for v in values[k]: if searchFor in v: return k return None #Checking if string ‘Mary’ … Read more
In object literal terms, b is a property. Properties are either strings or symbols in JavaScript, although when defining the property name inside an object literal you may omit the string delimiters. for (key in a) { alert(typeof key); //-> “string” }
You’ll want a Map<String, String>. Classes that implement the Map interface include (but are not limited to): HashMap LinkedHashMap Hashtable Each is designed/optimized for certain situations (go to their respective docs for more info). HashMap is probably the most common; the go-to default. For example (using a HashMap): Map<String, String> map = new HashMap<String, String>(); … Read more
Use: var dict = []; // Create an empty array dict.push({ key: “keyName”, value: “the value” }); // Repeat this last part as needed to add more key/value pairs Basically, you’re creating an object literal with two properties (called key and value) and inserting it (using push()) into the array. This does not create a … Read more
var dict = []; // create an empty array dict.push({ key: “keyName”, value: “the value” }); // repeat this last part as needed to add more key/value pairs Basically, you’re creating an object literal with 2 properties (called key and value) and inserting it (using push()) into the array. Edit: So almost 5 years later, … Read more
You can also use envsubst when deploying. e.g. cat app/deployment.yaml | envsubst | kubectl apply … It will replace all variables in the file with their values. We are successfully using this approach on our CI when deploying to multiple environments, also to inject the CI_TAG etc into the deployments.
There’s public static class AbstractMap.SimpleEntry<K,V>. Don’t let the Abstract part of the name mislead you: it is in fact NOT an abstract class (but its top-level AbstractMap is). The fact that it’s a static nested class means that you DON’T need an enclosing AbstractMap instance to instantiate it, so something like this compiles fine: Map.Entry<String,Integer> … Read more