49 lines
1.2 KiB
TypeScript
49 lines
1.2 KiB
TypeScript
export class CheckoutPrice {
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private constructor(private readonly amountUsd: number) {
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if (amountUsd < 0) {
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throw new Error('Price cannot be negative');
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}
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if (amountUsd > 10000) {
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throw new Error('Price exceeds maximum of $10,000');
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}
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}
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static fromString(priceStr: string): CheckoutPrice {
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const trimmed = priceStr.trim();
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if (!trimmed.startsWith('$')) {
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throw new Error('Invalid price format: missing dollar sign');
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}
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const dollarSignCount = (trimmed.match(/\$/g) || []).length;
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if (dollarSignCount > 1) {
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throw new Error('Invalid price format: multiple dollar signs');
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}
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const numericPart = trimmed.substring(1).replace(/,/g, '');
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if (numericPart === '') {
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throw new Error('Invalid price format: no numeric value');
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}
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const amount = parseFloat(numericPart);
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if (isNaN(amount)) {
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throw new Error('Invalid price format: not a valid number');
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}
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return new CheckoutPrice(amount);
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}
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toDisplayString(): string {
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return `$${this.amountUsd.toFixed(2)}`;
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}
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getAmount(): number {
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return this.amountUsd;
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}
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isZero(): boolean {
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return this.amountUsd < 0.001;
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}
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} |