1
0
mirror of https://github.com/laurent22/joplin.git synced 2024-12-09 08:45:55 +02:00
joplin/ReactNativeClient/lib/ArrayUtils.js

61 lines
1.4 KiB
JavaScript

const ArrayUtils = {};
ArrayUtils.unique = function(array) {
return array.filter(function(elem, index, self) {
return index === self.indexOf(elem);
});
}
ArrayUtils.removeElement = function(array, element) {
const index = array.indexOf(element);
if (index < 0) return array;
array.splice(index, 1);
return array;
}
// https://stackoverflow.com/a/10264318/561309
ArrayUtils.binarySearch = function(items, value) {
var startIndex = 0,
stopIndex = items.length - 1,
middle = Math.floor((stopIndex + startIndex)/2);
while(items[middle] != value && startIndex < stopIndex){
//adjust search area
if (value < items[middle]){
stopIndex = middle - 1;
} else if (value > items[middle]){
startIndex = middle + 1;
}
//recalculate middle
middle = Math.floor((stopIndex + startIndex)/2);
}
//make sure it's the right value
return (items[middle] != value) ? -1 : middle;
}
ArrayUtils.findByKey = function(array, key, value) {
for (let i = 0; i < array.length; i++) {
const o = array[i];
if (typeof o !== 'object') continue;
if (o[key] === value) return o;
}
return null;
}
ArrayUtils.contentEquals = function(array1, array2) {
if (array1 === array2) return true;
if (!array1.length && !array2.length) return true;
if (array1.length !== array2.length) return false;
for (let i = 0; i < array1.length; i++) {
const a1 = array1[i];
if (array2.indexOf(a1) < 0) return false;
}
return true;
}
module.exports = ArrayUtils;