98 lines
2.6 KiB
TypeScript
98 lines
2.6 KiB
TypeScript
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export function debounce<T extends (...args: any[]) => any>(
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func: T,
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wait: number
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): (...args: Parameters<T>) => void {
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let timeout: number | undefined;
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return function executedFunction(...args: Parameters<T>) {
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const later = () => {
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clearTimeout(timeout);
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func(...args);
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};
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clearTimeout(timeout);
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timeout = window.setTimeout(later, wait);
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};
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}
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export function throttle<T extends (...args: any[]) => any>(
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func: T,
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limit: number
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): (...args: Parameters<T>) => void {
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let inThrottle: boolean;
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return function executedFunction(...args: Parameters<T>) {
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if (!inThrottle) {
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func.apply(this, args);
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inThrottle = true;
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setTimeout(() => inThrottle = false, limit);
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}
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};
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}
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export function formatFileSize(bytes: number): string {
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if (bytes === 0) return '0 Bytes';
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const k = 1024;
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const sizes = ['Bytes', 'KB', 'MB', 'GB'];
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const i = Math.floor(Math.log(bytes) / Math.log(k));
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return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
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}
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export function isInViewport(element: Element, margin = 0): boolean {
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const rect = element.getBoundingClientRect();
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return (
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rect.top >= -margin &&
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rect.left >= -margin &&
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rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) + margin &&
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rect.right <= (window.innerWidth || document.documentElement.clientWidth) + margin
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);
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}
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export class PerformanceMonitor {
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private static marks = new Map<string, number>();
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private static measures: Array<{ name: string; duration: number }> = [];
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public static mark(name: string) {
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this.marks.set(name, performance.now());
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}
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public static measure(name: string, startMark: string) {
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const start = this.marks.get(startMark);
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if (start) {
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const duration = performance.now() - start;
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this.measures.push({ name, duration });
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this.marks.delete(startMark);
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return duration;
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}
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return 0;
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}
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public static getReport() {
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const report = {
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measures: [...this.measures],
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averages: {} as Record<string, number>,
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};
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// Calculate averages for repeated measures
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const grouped = new Map<string, number[]>();
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for (const measure of this.measures) {
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if (!grouped.has(measure.name)) {
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grouped.set(measure.name, []);
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}
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grouped.get(measure.name)!.push(measure.duration);
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}
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for (const [name, durations] of grouped) {
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report.averages[name] = durations.reduce((a, b) => a + b, 0) / durations.length;
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}
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return report;
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}
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public static clear() {
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this.marks.clear();
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this.measures = [];
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}
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}
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