1. Null, Undefined, Empty Checks Shorthand When creating new variables sometimes you want to check if the variable you’re referencing for it’s value isn’t null or undefined. I would say this is a very common
//Shorthand let data1, data2= 1; 1. 2. 3. 4. 5. 23、分配默认值 let data1 = null, data2 = test1 || ''; console.log("null check", data2); // output will be "" 1. 2. 3. 24、空约束 最常用的操作数之一,但请确保你的值为真、非空字符串、定义的值和非空值。 // Longhan...
// Shorthand let test2 = test1 || ''; 5.null值检查和分配默认值 let test1 = null, test2 = test1 || ''; console.log("null check", test2); // output will be "" 6.undefined值检查和分配默认值 let test1 = undefined, test2 = test1 || ''; console.log("undefined check", test2); ...
eslint: object-shorthand // bad const foo = { value: 1, addValue: function (value) { return foo.value + value; } }; // good const foo = { value: 1, addValue(value) { return foo.value + value; } }; 3.4 Use property value shorthand. eslint: object-shorthand Why? It is ...
Like Python, however, RapydScript supports new-line shorthand using a ;, which you could use to place the comma on the same line:hash = { 'foo': def(): print('foo');, 'bar': def(): print('bar') }It is because of easy integration with JavaScript's native libraries that Rapyd...
Why? It’s easier to tell which properties are using the shorthand. const anakinSkywalker = 'Anakin Skywalker'; const lukeSkywalker = 'Luke Skywalker'; // bad const obj = { episodeOne: 1, twoJediWalkIntoACantina: 2, lukeSkywalker, episodeThree: 3, mayTheFourth: 4, anakinSkywalker,...
, we no longer have to explicitly check whether the deeper nested values are valid or not. If we're trying to access a property on an undefined or null value (nullish), the expression short-circuits and returns undefined. person.pet?.name: person has a property named pet: person.pet is...
// Shorthand let test2 = test1 ||''; 5、 null 检查和默认赋值 let test1 =null, test2 = test1 ||''; console.log("null check", test2);// 输出 "" 6、 undefined 检查和默认赋值 let test1 =undefined, test2 = test1 ||''; console.log("undefined check", test2);// 输出 "" ...
3.5 将你的所有缩写放在对象声明的开始. Why? 这样也是为了更方便的知道有哪些属性用了缩写. const anakinSkywalker = 'Anakin Skywalker'; const lukeSkywalker = 'Luke Skywalker'; // bad const obj = { episodeOne: 1, twoJediWalkIntoACantina: 2, lukeSkywalker, episodeThree: 3, mayTheFourth:...
// Shorthand lettest2 = test1 ||''; 5.null 值检查和分配默认值 lettest1 =null, test2 = test1 ||''; console.log("null check", test2);// output will be "" 6.undefined 值检查和分配默认值 lettest1 =undefined, test2 = test1 ||''; ...