@@ -103,6 +103,34 @@ export function cloneValue(value: any): any {
103103 return value ;
104104}
105105
106+ /**
107+ * Parse provided input to Date.
108+ * @param value input to parse
109+ * @returns Date if parse succeed or null
110+ * @hidden
111+ */
112+ export function parseDate ( value : any ) : Date | null {
113+ // if value is Invalid Date return null
114+ if ( isDate ( value ) ) {
115+ return ! isNaN ( value . getTime ( ) ) ? value : null ;
116+ }
117+ return value ? new Date ( value ) : null ;
118+ }
119+
120+ /**
121+ * Returns an array with unique dates only.
122+ * @param columnValues collection of date values (might be numbers or ISO 8601 strings)
123+ * @returns collection of unique dates.
124+ * @hidden
125+ */
126+ export function uniqueDates ( columnValues : any [ ] ) {
127+ return columnValues . reduce ( ( a , c ) => {
128+ if ( ! a . cache [ c . label ] ) { a . result . push ( c ) ; }
129+ a . cache [ c . label ] = true ;
130+ return a ;
131+ } , { result : [ ] , cache : { } } ) . result ;
132+ }
133+
106134/**
107135 * Checks if provided variable is Object
108136 * @param value Value to check
@@ -119,8 +147,8 @@ export function isObject(value: any): boolean {
119147 * @returns true if provided variable is Date
120148 * @hidden
121149 */
122- export function isDate ( value : any ) {
123- return Object . prototype . toString . call ( value ) === '[object Date]' ;
150+ export function isDate ( value : any ) : boolean {
151+ return value instanceof Date ;
124152}
125153
126154/**
@@ -326,9 +354,9 @@ export interface CancelableBrowserEventArgs extends CancelableEventArgs {
326354 event ?: Event ;
327355}
328356
329- export interface IBaseCancelableBrowserEventArgs extends CancelableBrowserEventArgs , IBaseEventArgs { }
357+ export interface IBaseCancelableBrowserEventArgs extends CancelableBrowserEventArgs , IBaseEventArgs { }
330358
331- export interface IBaseCancelableEventArgs extends CancelableEventArgs , IBaseEventArgs { }
359+ export interface IBaseCancelableEventArgs extends CancelableEventArgs , IBaseEventArgs { }
332360
333361export const HORIZONTAL_NAV_KEYS = new Set ( [ 'arrowleft' , 'left' , 'arrowright' , 'right' , 'home' , 'end' ] ) ;
334362
@@ -349,7 +377,8 @@ export const NAVIGATION_KEYS = new Set([
349377] ) ;
350378export const ROW_EXPAND_KEYS = new Set ( 'right down arrowright arrowdown' . split ( ' ' ) ) ;
351379export const ROW_COLLAPSE_KEYS = new Set ( 'left up arrowleft arrowup' . split ( ' ' ) ) ;
352- export const SUPPORTED_KEYS = new Set ( [ ...Array . from ( NAVIGATION_KEYS ) , 'enter' , 'f2' , 'escape' , 'esc' , 'pagedown' , 'pageup' , '+' , 'add' ] ) ;
380+ export const ROW_ADD_KEYS = new Set ( [ '+' , 'add' , '≠' , '±' , '=' ] ) ;
381+ export const SUPPORTED_KEYS = new Set ( [ ...Array . from ( NAVIGATION_KEYS ) , ...Array . from ( ROW_ADD_KEYS ) , 'enter' , 'f2' , 'escape' , 'esc' , 'pagedown' , 'pageup' ] ) ;
353382export const HEADER_KEYS = new Set ( [ ...Array . from ( NAVIGATION_KEYS ) , 'escape' , 'esc' , 'l' ,
354383 /** This symbol corresponds to the Alt + L combination under MAC. */
355384 '¬' ] ) ;
@@ -464,7 +493,7 @@ export function yieldingLoop(count: number, chunkSize: number, callback: (index:
464493 let i = 0 ;
465494 const chunk = ( ) => {
466495 const end = Math . min ( i + chunkSize , count ) ;
467- for ( ; i < end ; ++ i ) {
496+ for ( ; i < end ; ++ i ) {
468497 callback ( i ) ;
469498 }
470499 if ( i < count ) {
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