+// Thanks: https://gist.github.com/ghinda/8442a57f22099bdb2e34
+function objectToFormData (obj: any, form?: FormData, namespace?: string) {
+ let fd = form || new FormData()
+ let formKey
+
+ for (let key of Object.keys(obj)) {
+ if (namespace) formKey = `${namespace}[${key}]`
+ else formKey = key
+
+ if (obj[key] === undefined) continue
+
+ if (Array.isArray(obj[key]) && obj[key].length === 0) {
+ fd.append(key, null)
+ continue
+ }
+
+ if (obj[key] !== null && typeof obj[ key ] === 'object' && !(obj[ key ] instanceof File)) {
+ objectToFormData(obj[ key ], fd, formKey)
+ } else {
+ fd.append(formKey, obj[ key ])
+ }
+ }
+
+ return fd
+}
+
+function lineFeedToHtml (obj: object, keyToNormalize: string) {
+ return immutableAssign(obj, {
+ [keyToNormalize]: obj[keyToNormalize].replace(/\r?\n|\r/g, '<br />')
+ })
+}
+
+function removeElementFromArray <T> (arr: T[], elem: T) {
+ const index = arr.indexOf(elem)
+ if (index !== -1) arr.splice(index, 1)
+}
+
+function sortBy (obj: any[], key1: string, key2?: string) {
+ return obj.sort((a, b) => {
+ const elem1 = key2 ? a[key1][key2] : a[key1]
+ const elem2 = key2 ? b[key1][key2] : b[key1]
+
+ if (elem1 < elem2) return -1
+ if (elem1 === elem2) return 0
+ return 1
+ })