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// @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>
));
};
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