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function.js
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function.js
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/**
* Common functions and function call helpers.
*
* @module function
*/
import * as array from './array.js'
import * as object from './object.js'
/**
* Calls all functions in `fs` with args. Only throws after all functions were called.
*
* @param {Array<function>} fs
* @param {Array<any>} args
*/
export const callAll = (fs, args, i = 0) => {
try {
for (; i < fs.length; i++) {
fs[i](...args)
}
} finally {
if (i < fs.length) {
callAll(fs, args, i + 1)
}
}
}
export const nop = () => {}
/**
* @template T
* @param {function():T} f
* @return {T}
*/
export const apply = f => f()
/**
* @template A
*
* @param {A} a
* @return {A}
*/
export const id = a => a
/**
* @template T
*
* @param {T} a
* @param {T} b
* @return {boolean}
*/
export const equalityStrict = (a, b) => a === b
/**
* @template T
*
* @param {Array<T>|object} a
* @param {Array<T>|object} b
* @return {boolean}
*/
export const equalityFlat = (a, b) => a === b || (a != null && b != null && a.constructor === b.constructor && ((a instanceof Array && array.equalFlat(a, /** @type {Array<T>} */ (b))) || (typeof a === 'object' && object.equalFlat(a, b))))
/**
* @param {any} a
* @param {any} b
* @return {boolean}
*/
export const equalityDeep = (a, b) => {
if (a == null || b == null) {
return equalityStrict(a, b)
}
if (a.constructor !== b.constructor) {
return false
}
if (a === b) {
return true
}
switch (a.constructor) {
case ArrayBuffer:
a = new Uint8Array(a)
b = new Uint8Array(b)
// eslint-disable-next-line no-fallthrough
case Uint8Array: {
if (a.byteLength !== b.byteLength) {
return false
}
for (let i = 0; i < a.length; i++) {
if (a[i] !== b[i]) {
return false
}
}
break
}
case Set: {
if (a.size !== b.size) {
return false
}
for (const value of a) {
if (!b.has(value)) {
return false
}
}
break
}
case Map: {
if (a.size !== b.size) {
return false
}
for (const key of a.keys()) {
if (!b.has(key) || !equalityDeep(a.get(key), b.get(key))) {
return false
}
}
break
}
case Object:
if (object.length(a) !== object.length(b)) {
return false
}
for (const key in a) {
if (!object.hasProperty(a, key) || !equalityDeep(a[key], b[key])) {
return false
}
}
break
case Array:
if (a.length !== b.length) {
return false
}
for (let i = 0; i < a.length; i++) {
if (!equalityDeep(a[i], b[i])) {
return false
}
}
break
default:
return false
}
return true
}