Table of contents

• Utilities For Web Projects
  • Filter Util
  • Sort Util
  • Dom Helper
  • Browser Storage
  • Cache Helpers
  • Data Change Tracker
  • Position Calculator
  • Unique List
  • Chain Functions
  • Function Decoratos
  • Conditional Helpers
  • Extend Array

Utilities For Web Projects

Some helper classes for web.

Filter Util

Search helper for lists. Search values in array with predicate or field string. Also multiple field can be searched.

const items = [{ name: "salih" }, { name: "Ali" }];
const filtered = filterUtil.filter(items, "Sa", "name"); //[{ name: "salih" }]

-------

const items = [
  { name: "salih", surname: "sayer" },
  { name: "Deli", surname: "tuna" },
  { name: "Elif", surname: "pon" },
];

//multiple field
const filtered = filterUtil.filter(
  items,
  "a",
  (e) => e.name,
  (e) => e.surname
);

//[{ name: "salih", surname: "sayer" },{ name: "Deli", surname: "tuna" }]

Sort Util

Sort helper for lists. Sort by single or multiple field. field arguments can be string or predicate

let items = [{ id: 3 }, { id: 1 }, { id: 2 }];

sortUtil.sort(items, (e) => e.id); // [{ id: 1 }, { id: 2 }, { id: 3 }]

-----------

 let items = [
  { name: "a", age: 3 },
  { name: "a", age: 2 },
  { name: "b", age: 1 },
];

sortUtil.sortMultiple(items,
  { field: "name", priority: 1 },
  { field: (e) => e.age, priority: 2 }
);
//[{ name: "a", age: 2 },{ name: "a", age: 3 },{ name: "b", age: 1 },]

Dom Helper

Some dome helper methods

domUtil.findParentElement(el,'class','id');
domUtil.randomColor();
domUtil.touchPositionInelement(ev,parentElement);
domUtil.checkIsAtTheBottom(options);
domUtil.handleInfineteScroll(element,() => console.log('at the bottom'));

Browser Storage

sessionStorage and localStorage helpers

sessionStorageUtil.setItem('key','value');
sessionStorageUtil.getItem('key');
sessionStorageUtil.removeItem('key');
sessionStorageUtil.clear();

localeStorageUtil.setItem('key','value')
...

Cache Helpers

Cache data to browser storage with function calls or decorators. Decorators caches the return value with the name of method + args as key

cacheUtil.add(EnumCacheType.SessionStorage,'key',{id:1});
cacheUtil.get(EnumCacheType.SessionStorage,'key')
cacheUtil.clear(EnumCacheType.SessionStorage,'key');

@cacheUtil.cache(EnumCacheType.SessionStorage)
testMethod(){
  return {id:1}
}

Data Change Tracker

Check if data is changed when a popup is opened and user tries to close it.

let data: string = "test";
let uuid = dataChangeTracker.registerData(data);
data = "test2";

dataChangeTracker.isDataChanged(uuid, data) // true

Position Calculator

Calculate positions for elements like tooltip, popover. Most of the methods works with ElementDimensions typed objects. createDimension(el:HTMLElement) method creates that object.

const offset positionCalculator.offset(el);

const dimension positionCalculator.createDimensions(el);

positionCalculator.isDimensionOutOfScreen(dimensions);
positionCalculator.horizontalCenter(dimensions);
positionCalculator.verticalCenter(dimensions);
positionCalculator.shiftToFitScreen(dimensions);
positionCalculator.snapToBottom(dimensions);
positionCalculator.snapToTop(dimensions);
positionCalculator.snapToLeft(dimensions);
positionCalculator.snapToRight(dimensions);

Unique List

Create a uniquelist with compareFunction. push method prevents same values to be added with compareFunction remove method finds and removes values using compareFunction

const list = createUniqueList(
    (a: number, b: number) => a === b, //compareFn
    [1, 2, 3] // initial values. Optional
);
list.push(2);

// list = [1,2,3]

type ListItem = { id: number };

const list = createUniqueList(
    (a: ListItem, b: ListItem) => a.id === b.id,
    [{ id: 1 }, { id: 3 }]
);

list.remove({ id: 1 });

// list = [{ id: 3 }]

Chain Functions

Run functions consecutive with optional conditions. Next function uses previous functions return value. If any required condition is not met returns 'null'

const chain = new ChainFunctions(
  (value: number) => value + 2,
  (value: number) => value * 3
);

const result = chain.run(1); // 9

-------------
//with condition
const firstFn = (value: string) => value + "-";
const secondFn = {
    fn: (value: string) => value + ":",
    when: (value: string) => value.indexOf("true") > -1,
};

const chain = new ChainFunctions(firstFn,secondFn);

const result = chain.run("false"); // false-

-------------
//with required
const firstFn = (value: number) => value * 10;
const secondFn = {
    fn: (value: number) => value * 10,
    when: (value: number) => value < 100,
    required: true,
}
const thirdFn = (value: number) => value * 2

const chain = new ChainFunctions(firstFn,secondFn,thirdFn);

const result = chain.run(10); // null

Function Decoratos

Function decorators that maps or caches the result of function.

@mapTo(mapFunction)
testMethod(){
  return {id:1}
}

@mapToArray(mapFunction)
testMethod(){
  return [{id:1}]
}

@cache(EnumCacheType.SessionStorage)
testMethod(){
  return {id:1}
}

@cacheToMemory()
testMethod(){
  return {id:1}
}

@cacheToLocalStorage()
testMethod(){
  return {id:1}
}

@cacheToSessionStorage()
testMethod(){
  return {id:1}
}

Conditional Helpers

Helpers for simple switch , if-else

//SWITCH
const conditional = createSwitch({ "1": 1, "2": 2, "3": 3 });
const result = conditional("3") // 3;

//with default value
const conditional = createSwitch<string, number | string>({ "1": 1 }, "");
const result = conditional("3"); // ""

//with function
const conditional = createSwitch({ "1": (value: string) => +value, "2": (value: string) => +value * 2 });
const result = conditional("2")?.("2"); // 4

//IF-ELSE : only runs the first met condition
const conditional = createConditional(
  [(value: number) => value < 5, "small"],
  [(value: number) => value > 5, "big"],
  [(value: number) => true , "default"]
);

const result = conditional(6); // "big"

//with function
const conditional = createConditional(
  [(value: boolean) => value, (value: number) => value * 2],
  [(value: boolean) => !value, (value: number) => value / 2]
);

const result = conditional(false)?.(2); // 1

Extend Array

multiple extended methods for array prototype. call extendArray() method to add all methods to array.

remove(o: T): number;
last(): T;
findRemove(findFunction?: (item: T, index?: number, obj?: Array<T>) => boolean): void;
pushIf(item: T, statement?: (arr: Array<T>) => boolean): void;
pushRange(items: Array<T>, statement?: (item: T) => boolean): void;
forEachAsync(callback: (item: T, index: number, array: T[]) => void): Promise<void>;
toGroupModel(groupBy: (item: T) => any): GroupModel<T>;
toGroupModelValues(groupBy: (item: T) => any): T[][];
sum(statement: (item: T) => number): number;
toGroupItems<ChildType = T>(
  groupBy: (item: T) => any,
  itemChildProp?: (item: T) => any,
  childGroupBy?: (item: ChildType) => any
): GroupItem<T, ChildType>[];
distinct(getProp?: GetPropValueType<T>): Array<T>;
mapIf<T2>(map: (item: T) => T2, condition: (item: T) => boolean): Array<T2>;
filterByCollection<T2>(getProp: (item: T) => T2, collection: T2[]): T[];
filterByExcludesCollection<T2>(getProp: (item: T) => T2, collection: T2[]): T[];
findByCollection<T2>(getProp: (item: T) => T2, collection: T2[]): T;