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store.js
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128 lines (118 loc) · 2.68 KB
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import {noop} from './lang'
/**
* Mix properties into target object.
*/
export function extend(to, _from) {
for (const key in _from) {
to[key] = _from[key]
}
return to
}
/**
* Multiple Array traversal
* @return 1 continue
* @return 2 break
*/
export function traverse(data, childrenKeys = [], fn = noop) {
if (!data) {
return
}
if (typeof childrenKeys === 'function') {
fn = childrenKeys
childrenKeys = []
}
let level = 0 // current level
let indexs = [] // index set of all levels
const walk = curData => {
for (let i = 0, len = curData.length; i < len; i++) {
const isArray = Array.isArray(curData[i])
const key = Array.isArray(childrenKeys) ? childrenKeys[level] : childrenKeys
if (isArray || (curData[i] && curData[i][key])) {
level++
indexs.push(i)
walk(isArray ? curData[i] : curData[i][key])
} else if (level >= childrenKeys.length) {
const res = fn(curData[i], level, [...indexs, i])
if (res === 1) {
continue
} else if (res === 2) {
break
}
} else {
continue
}
}
level = 0
indexs = []
}
walk(data)
}
/**
* Merge an Array of Objects into a single Object.
*/
export function toObject(arr) {
const res = {}
for (let i = 0; i < arr.length; i++) {
if (arr[i]) {
extend(res, arr[i])
}
}
return res
}
/**
* Convert an Array-like object to a real Array.
*/
export function toArray(list, start) {
start = start || 0
let i = list.length - start
const ret = []
while (i--) {
ret.unshift(list[i + start])
}
return ret
}
/**
* whether item is in list or list equal item
*/
export function inArray(list, item) {
return Array.isArray(list) ? !!~list.indexOf(item) : item === list
}
/**
* Convert a input value to a number for persistence.
* If the conversion fails, return original string.
*/
export function toNumber(val) {
const n = parseFloat(val)
return isNaN(n) ? val : n
}
/**
* Convert a value to a string
*/
export function toString(val) {
return val == null ? '' : typeof val === 'object' ? JSON.stringify(val, null, 2) : String(val)
}
/**
* Determine whether the two objects are equal or not shallowly
*/
export function compareObjects(object0, object1) {
let ret = true
if (!object0 || !object1) {
ret = false
} else if (typeof object0 !== 'object' || typeof object1 !== 'object') {
ret = false
} else if (JSON.stringify(object0) !== JSON.stringify(object1)) {
ret = false
}
return ret
}
/**
* Check object is empty
*/
export function isEmptyObject(obj) {
for (const key in obj) {
if (obj.hasOwnProperty(key)) {
return false
}
}
return true
}