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70 function updateArray(array) { 71 var changeListener = collectionListener(array); 72 var listener = observe(array, changeListener); 73 array.silentSplice = function () { 74 listener(); 75 var res; 76 runInAction(() => { res = array.splice.apply(array, arguments) }); 77 listener = observe(array, changeListener); 78 return res; 79 }; 80 }
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44 _addArrayItem() { 45 const newId = Math.round(Math.random() * 100); 46 const newItem = { id: newId }; 47 this.myArray = [ 48 ...this.myArray, 49 newItem, 50 ]; 51 52 /** 53 * An alternative method is to mutate the array and then call 54 * requestUpdate() to notify LitElement the property changed. 55 */ 56 // this.myArray.push(newItem); 57 // this.requestUpdate(); 58 }
18 updateArray (key, value) { 19 const array = this.props[formDataProp][key] 20 const index = array.indexOf(value) 21 22 if (array.indexOf(value) > -1) { 23 array.splice(index, 1) 24 } else { 25 array.push(value) 26 } 27 }
9 function insertIntoArray<T>(array: T[], object: T): T[] { 10 return array ? [object, ...array] : [object]; 11 }
7 function updateArrayEntry<T>( 8 array: Array<T>, 9 scope: number | string, 10 newVal: any 11 ): Array<T> { 12 if (newVal === array[scope]) { 13 return array; 14 } 15 const index = parseInt(scope as string); 16 if (typeof newVal === 'undefined') { 17 return array.filter((_val, i) => i !== index); 18 } 19 return array.map((val, i) => (i === index ? newVal : val)); 20 }