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3.25 kB
| // @flow | |
| import React from 'react'; | |
| import replace from 'string-replace-to-array'; | |
| /* | |
| Best guess at if user is on a mobile device. Used in the modal components | |
| to determine where the modal should be positioned, how it should close and | |
| scroll, etc | |
| */ | |
| export function isMobile() { | |
| let userAgent = navigator.userAgent || navigator.vendor || window.opera; | |
| if ( | |
| /windows phone/i.test(userAgent) || | |
| /android/i.test(userAgent) || | |
| (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) | |
| ) { | |
| return true; | |
| } | |
| return false; | |
| } | |
| export const debounce = (func: Function, wait: number, immediate: boolean) => { | |
| let timeout; | |
| return function() { | |
| let context = this, | |
| args = arguments; | |
| let later = function() { | |
| timeout = null; | |
| if (!immediate) func.apply(context, args); | |
| }; | |
| let callNow = immediate && !timeout; | |
| // $FlowFixMe | |
| clearTimeout(timeout); | |
| timeout = setTimeout(later, wait); | |
| if (callNow) func.apply(context, args); | |
| }; | |
| }; | |
| export const throttle = (func: Function, threshold: number, scope: any) => { | |
| threshold || (threshold = 250); | |
| let last, deferTimer; | |
| return function() { | |
| let context = scope || this; | |
| let now = +new Date(), | |
| args = arguments; | |
| if (last && now < last + threshold) { | |
| // hold on to it | |
| clearTimeout(deferTimer); | |
| deferTimer = setTimeout(function() { | |
| last = now; | |
| func.apply(context, args); | |
| }, threshold); | |
| } else { | |
| last = now; | |
| func.apply(context, args); | |
| } | |
| }; | |
| }; | |
| // Truncate a string nicely to a certain length | |
| export const truncate = (str: string, length: number) => { | |
| if (str.length <= length) { | |
| return str; | |
| } | |
| const subString = str.substr(0, length); | |
| return subString.substr(0, subString.lastIndexOf(' ')) + '…'; | |
| }; | |
| // takes a number like 1,480 and returns a truncated number: 1.5k | |
| // takes an option 'places' argument to round - default to 1 (e.g. 1 = 1.5k. 2 = 1.48k) | |
| export const truncateNumber = (number: number, places: number = 1) => { | |
| const truncated = | |
| number > 999 ? (number / 1000).toFixed(places) + 'k' : number; | |
| // if the last number is 0 and we are rounding to one place, just ommit | |
| const lastDigit = truncated.toString().slice(-2); | |
| if (lastDigit === '0k' && places === 1) { | |
| return truncated.toString().slice(0, -3) + 'k'; | |
| } else { | |
| return truncated; | |
| } | |
| }; | |
| export const sortByDate = (array: Array<any>, key: string, order: string) => { | |
| return array.sort((a, b) => { | |
| const x = new Date(a[key]).getTime(); | |
| const y = new Date(b[key]).getTime(); | |
| // desc = older to newest from top to bottom | |
| const val = order === 'desc' ? y - x : x - y; | |
| return val; | |
| }); | |
| }; | |
| export const sortByTitle = (array: Array<any>) => { | |
| return array.sort((a, b) => { | |
| const x = a['name']; | |
| const y = b['name']; | |
| const val = x.localeCompare(y, { | |
| sensitivity: 'base', | |
| numeric: 'true', | |
| caseFirst: 'upper', | |
| }); | |
| return val; | |
| }); | |
| }; | |
| export const renderMarkdownLinks = (text: string) => { | |
| const MARKDOWN_LINK = /(?:\[(.*?)\]\((.*?)\))/g; | |
| return replace(text, MARKDOWN_LINK, (fullLink, text, url) => ( | |
| <a href={url} target="_blank" rel="noopener noreferrer"> | |
| {text} | |
| </a> | |
| )); | |
| }; | |