{"version":"1.0","provider_name":"Kodlar\u0131n Gizemli D\u00fcnyas\u0131","provider_url":"https:\/\/fatihsoysal.com\/blog","author_name":"Fatih Soysal","author_url":"https:\/\/fatihsoysal.com\/blog\/author\/fatihsoysal\/","title":"JavaScript Nullish Coalescing (??): Varsay\u0131lan De\u011fer Belirleme","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"sKV9Rxr4d7\"><a href=\"https:\/\/fatihsoysal.com\/blog\/javascript-nullish-coalescing-varsayilan-deger-belirleme\/\">JavaScript Nullish Coalescing (??): Varsay\u0131lan De\u011fer Belirleme<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/fatihsoysal.com\/blog\/javascript-nullish-coalescing-varsayilan-deger-belirleme\/embed\/#?secret=sKV9Rxr4d7\" width=\"600\" height=\"338\" title=\"&#8220;JavaScript Nullish Coalescing (??): Varsay\u0131lan De\u011fer Belirleme&#8221; &#8212; Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" data-secret=\"sKV9Rxr4d7\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n<\/script>\n","description":"Modern JavaScript geli\u015ftirmesinde, de\u011fi\u015fkenlerin beklenen bir de\u011fere sahip olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek, \u00f6zellikle de d\u0131\u015f kaynaklardan gelen verilerle (API yan\u0131tlar\u0131, kullan\u0131c\u0131 girdileri vb.) \u00e7al\u0131\u015f\u0131rken kritik bir \u00f6neme sahiptir. Kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131z en yayg\u0131n problemlerden biri, bir de\u011fi\u015fkenin null veya undefined olmas\u0131 durumunda ne yap\u0131laca\u011f\u0131d\u0131r. Geli\u015ftiriciler olarak, genellikle bu t\u00fcr bo\u015f de\u011ferler yerine anlaml\u0131 bir varsay\u0131lan de\u011fer atayarak uygulamalar\u0131m\u0131z\u0131n daha sa\u011flam ve \u00f6ng\u00f6r\u00fclebilir olmas\u0131n\u0131 isteriz. \u0130\u015fte tam bu noktada, ES2020 ile hayat\u0131m\u0131za giren JavaScript Nullish Coalescing Operat\u00f6r\u00fc (??) devreye girerek, bu yayg\u0131n soruna \u015f\u0131k ve etkili bir \u00e7\u00f6z\u00fcm sunar. Bu makalede, ?? operat\u00f6r\u00fcn\u00fcn ne oldu\u011funu, nas\u0131l kullan\u0131ld\u0131\u011f\u0131n\u0131, geleneksel y\u00f6ntemlerden farklar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya senaryolar\u0131nda nas\u0131l bir kolayl\u0131k sa\u011flad\u0131\u011f\u0131n\u0131 derinlemesine inceleyece\u011fiz. Amac\u0131m\u0131z, ister tecr\u00fcbeli bir JavaScript geli\u015ftiricisi olun ister yeni ba\u015fl\u0131yor olun, bu g\u00fc\u00e7l\u00fc operat\u00f6r\u00fc projelerinize entegre etmeniz i\u00e7in size kapsaml\u0131 bir rehber sunmakt\u0131r."}