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common functions
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| const isNil = val => val == null | |
| const isString = val => typeof val === 'string' || val.constructor === String | |
| const isNumber = val => !isNaN(parseFloat(val)) && isFinite(val) | |
| const isPlainObject = val => val && val.constructor.name === 'Object' | |
| const isObject = val => val && Object.prototype.toString.call(val) === '[object Object]' | |
| const isFunction = fn => typeof fn === 'function' | |
| const isClass = fn => isFunction(fn) && /^\s*class\s+/.test(fn.toString()) | |
| const isPromise = fn => fn.then && isFunction(fn.then) | |
| const sleep = ms => new Promise(resolve => setTimeout(() => resolve(), ms)) | |
| const isEmptyArray = arr => Array.isArray(arr) && !arr.length | |
| const isEmptyObject = obj => isObject(obj) && !Object.keys(obj).length | |
| const isEmptyString = str => str === '' | |
| const isZero = num => num === 0 | |
| const mapProp = prop => obj => obj[prop] | |
| const pipe = (...fns) => (x) => fns.reduce((v, f) => f(v), x) | |
| const compose = (...fns) => (x) => fns.reduceRight((v, f) => f(v), x) | |
| const camelToSnake = str => str.replace(/[\w]([A-Z])/g, (m) => m[0] + "_" + m[1] ).toLowerCase() | |
| const toDateRange = (start, end) => { | |
| const range = [] | |
| const dt = new Date(start) | |
| while(dt <= end) { | |
| range.push(new Date(dt)) | |
| dt.setDate(dt.getDate()+1) | |
| } | |
| return range | |
| } | |
| const paginateArray = (arr, page, limit) => arr.slice((page - 1) * limit, page * limit) | |
| const deepCopy = (value) => | |
| Array.isArray(value) | |
| ? value.map((i) => deepCopy(i)) | |
| : isPlainObject(value) ? Object.entries(value).reduce((acc, [ k, v ]) => { | |
| acc[k] = Array.isArray(v) | |
| ? v.map((i) => (isPlainObject(i) || Array.isArray(i)) ? deepCopy(i) : i) | |
| : v | |
| return acc; | |
| }, {}) | |
| : value; |
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