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February 22, 2018 00:39
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Point free style in TypeScript
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| interface Transaction { | |
| amount: number; | |
| } | |
| class Test { | |
| private const BIG_AMOUNT = 10; | |
| public getPositiveTransactions(transactions: Transaction[]) { | |
| // point free | |
| return transactions.filter(this.isPositive); | |
| // not point free | |
| // return transactions.filter((transaction: Transaction) => transaction.amount > 0)); | |
| } | |
| public getBigTransactions(transactions: Transaction[]) { | |
| // point free | |
| return transactions.filter(this.moreThan(BIG_AMOUNT)); | |
| // not point free | |
| // return transactions.filter((transaction: any) => transaction.amount > BIG_AMOUNT); | |
| } | |
| private isPositive(transaction: Transaction) { | |
| return transactions.amount > 0; | |
| } | |
| private moreThan(amount: number) { | |
| return (transaction: Transaction) => { | |
| return transactions.amount > amount; | |
| } | |
| } | |
| } |
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