Jestã§Dateã®ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã‚’モックã™ã‚‹ä¸‹è¨˜ã®é–¢æ•°ãŒã‚ã‚‹ã¨ã—ã¾ã—ょã†ã€‚ 1 2 3 function calcDuration(date: string) { return Math.abs(new Date().getFullYear() - new Date(date).getFullYear()); } ã“ã®é–¢æ•°ã®ãƒ†ã‚¹ãƒˆã‚’書ãã®ã«ã€æ³¨æ„ã—ãªã‘ã‚Œã°ã„ã‘ãªã„ã“ã¨ãŒ1点ã‚ã‚Šã¾ã™ã€‚ã‚‚ã†æ°—ã¥ã„ãŸã¨æ€ã„ã¾ã™ãŒã€new Date()ã®çµæžœã‚’固定値ã«ã—ãªã„ã¨ã€ãƒ†ã‚¹ãƒˆã®çµæžœãŒå®Ÿè¡Œæ™‚ã®æ—¥ä»˜ã«ä¾å˜ã—ã¦ã—ã¾ã„ã¾ã™ã®ã§ã€ç’°å¢ƒä¾å˜ãŒç™ºç”Ÿã—許容ã§ããªã„ã§ã—ょã†ã€‚Jestã«ã¯ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ãƒ¢ãƒƒã‚¯ã‚’å«ã‚ã€ã„ãã¤ã®ã‚„ã‚Šæ–¹ãŒã‚ã‚Šã¾ã™ãŒã€æ¨™æº–ビルトインオブジェクトã‹ã¤ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã®å ´åˆã€ã©ã†ãƒ¢ãƒƒã‚¯ã™ã‚‹ã‹ã€ãƒ‰ã‚ュメントã«ã¯è©³ã—ã書ã‹ã‚Œã¾ã›ã‚“ã§ã—ãŸã€‚ウェブã§æ¤œç´¢ã—ã¦ã¿ãŸçµæžœã€jest.spyOn(global, 'Date')ã¨ã„ã†æ„Ÿã˜ã§æ›¸ãã®ã¯ä¸€ç•ªç›´æ„Ÿçš„ã§æŸ”軟性ãŒé«˜
Google退è·ã—ã¾ã™ï½œxyx
React HooksãŒé¢ç™½ã„ - @mizumotokã®ãƒ–ãƒã‚°
Googleã€rel=prev/nextã®ã‚µãƒãƒ¼ãƒˆã‚’終了……実ã¯æ•°å¹´å‰ã‹ã‚‰ã™ã§ã«ä½¿ã£ã¦ã„ãªã‹ã£ãŸã¨ã„ã†ã‚ªãƒã‚ã‚Š
{{#tags}}- {{label}}
{{/tags}}