add memoization to few validators

src/components/forms/validator.js

@@ -2,9 +2,21 @@
 import { type FieldValidator } from 'final-form'
 import { getWeb3 } from '~/logic/wallets/getWeb3'
 
+export const simpleMemoize = (fn: Function) => {
+  let lastArg
+  let lastResult
+  return (arg: any) => {
+    if (arg !== lastArg) {
+      lastArg = arg
+      lastResult = fn(arg)
+    }
+    return lastResult
+  }
+}
+
 type Field = boolean | string | null | typeof undefined
 
-export const required = (value: Field) => (value ? undefined : 'Required')
+export const required = simpleMemoize((value: Field) => (value ? undefined : 'Required'))
 
 export const mustBeInteger = (value: string) => (!Number.isInteger(Number(value)) || value.includes('.') ? 'Must be an integer' : undefined)
 
@@ -46,17 +58,17 @@ export const maxValue = (max: number) => (value: string) => {
 
 export const ok = () => undefined
 
-export const mustBeEthereumAddress = (address: Field) => {
+export const mustBeEthereumAddress = simpleMemoize((address: Field) => {
   const isAddress: boolean = getWeb3().utils.isAddress(address)
 
   return isAddress ? undefined : 'Address should be a valid Ethereum address'
-}
+})
 
 export const minMaxLength = (minLen: string | number, maxLen: string | number) => (value: string) => (value.length >= +minLen && value.length <= +maxLen ? undefined : `Should be ${minLen} to ${maxLen} symbols`)
 
 export const ADDRESS_REPEATED_ERROR = 'Address already introduced'
 
-export const uniqueAddress = (addresses: string[]) => (value: string) => (addresses.includes(value) ? ADDRESS_REPEATED_ERROR : undefined)
+export const uniqueAddress = (addresses: string[]) => simpleMemoize((value: string) => (addresses.includes(value) ? ADDRESS_REPEATED_ERROR : undefined))
 
 export const composeValidators = (...validators: Function[]): FieldValidator => (value: Field) => validators.reduce((error, validator) => error || validator(value), undefined)
 

src/routes/safe/components/Balances/Tokens/screens/AddCustomToken/validators.js

@@ -3,20 +3,9 @@ import { List } from 'immutable'
 import { getWeb3 } from '~/logic/wallets/getWeb3'
 import { type Token } from '~/logic/tokens/store/model/token'
 import { sameAddress } from '~/logic/wallets/ethAddresses'
+import { simpleMemoize } from '~/components/forms/validator'
 // import { getStandardTokenContract } from '~/logic/tokens/store/actions/fetchTokens'
 
-export const simpleMemoize = (fn: Function) => {
-  let lastArg
-  let lastResult
-  return (arg: any) => {
-    if (arg !== lastArg) {
-      lastArg = arg
-      lastResult = fn(arg)
-    }
-    return lastResult
-  }
-}
-
 // eslint-disable-next-line
 export const addressIsTokenContract = simpleMemoize(async (tokenAddress: string) => {
   // SECOND APPROACH: