75 lines
1.7 KiB
TypeScript
75 lines
1.7 KiB
TypeScript
import { logError } from './logError';
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const DEBUG_MODE = false;
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export const canBeCastAsIntegerOrNull = (
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probableNumberOrNull: string | undefined | number | null,
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): probableNumberOrNull is number | null => {
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if (probableNumberOrNull === undefined) {
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if (DEBUG_MODE) logError('probableNumberOrNull === undefined');
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return false;
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}
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if (typeof probableNumberOrNull === 'number') {
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if (DEBUG_MODE) logError('typeof probableNumberOrNull === "number"');
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return Number.isInteger(probableNumberOrNull);
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}
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if (probableNumberOrNull === null) {
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if (DEBUG_MODE) logError('probableNumberOrNull === null');
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return true;
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}
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if (probableNumberOrNull === '') {
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if (DEBUG_MODE) logError('probableNumberOrNull === ""');
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return true;
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}
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if (typeof probableNumberOrNull === 'string') {
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const stringAsNumber = +probableNumberOrNull;
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if (isNaN(stringAsNumber)) {
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if (DEBUG_MODE) logError('isNaN(stringAsNumber)');
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return false;
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}
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if (Number.isInteger(stringAsNumber)) {
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if (DEBUG_MODE) logError('Number.isInteger(stringAsNumber)');
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return true;
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}
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}
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return false;
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};
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export const castAsIntegerOrNull = (
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probableNumberOrNull: string | undefined | number | null,
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): number | null => {
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if (canBeCastAsIntegerOrNull(probableNumberOrNull) === false) {
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throw new Error('Cannot cast to number or null');
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}
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if (probableNumberOrNull === null) {
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return null;
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}
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if (probableNumberOrNull === '') {
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return null;
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}
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if (typeof probableNumberOrNull === 'number') {
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return probableNumberOrNull;
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}
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if (typeof probableNumberOrNull === 'string') {
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return +probableNumberOrNull;
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}
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return null;
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};
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