nestedArray[2][1][0][0][0] ='deeper still';console.log(nestedArray[2][1][0][0][0]);// 现在输出:deeper still letmyNestedArray = [ ['unshift',false,1,2,3,'complex','nested'], ['loop','shift',6,7,1000,'method'], ['con
Spread Operator 则与 Rest Opeator 的功能正好相反,其常用于进行数组构建与解构赋值,也可以用于将某个数组转化为函数的参数列表,其基本使用方式如下: let cold = ['autumn', 'winter']; let warm = ['spring', 'summer']; // construct an array [...cold, ...warm] // => ['autumn', 'winter',...
3.8 Prefer the object spread operator over Object.assign to shallow-copy objects. Use the object rest operator to get a new object with certain properties omitted. // very bad const original = { a: 1, b: 2 }; const copy = Object.assign(original, { c: 3 }); // this mutates `...
let myNestedArray = [ // change code below this line ['unshift', false, 1, 2, 3, 'complex', 'nested'], ['loop', 'shift', 6, 7, 1000, 'method'], ['concat', false, true, 'spread', 'array',["deep"]], ['mutate', 1327.98, 'splice', 'slice', 'push', [["deeper"]]]...
Objects => true Undefined => false Null => false Booleans => the value of the boolean Numbers +0, -0, or NaN => false 其他=> true Strings '' => false 其他=> true if ([0] && []) { // true // 数组(即使是空数组)是对象,对象会计算成 true } ...
3.8 Prefer the object spread operator over Object.assign to shallow-copy objects. Use the object rest operator to get a new object with certain properties omitted. // very bad const original = { a: 1, b: 2 }; const copy = Object.assign(original, { c: 3 }); // this mutates `ori...
objects (default: true)— compact duplicate keys in object literals. passes (default: 1)— The maximum number of times to run compress. In some cases more than one pass leads to further compressed code. Keep in mind more passes will take more time. properties (default: true)— rewrite pro...
3.8【推荐】使用对象扩展操作符(spread operator)浅拷贝对象,而不是用Object.assign方法。 使用对象的剩余操作符(rest operator)来获得一个新对象,该对象省略了某些属性。 eslint:prefer-object-spread // very bad const original = { a: 1, b: 2 }; ...
十七、Concatenating Strings with Plus Equals Operator用加等于号连接字符串+= vara="1nini"a+="2mimi"console结果:“1nini2mimi” 十八、 Constructing Strings with Variables变量混搭字符串 letourNamer="Pi"letmyName="Mine is"+" "+ourNamer+"pi"console结果:“MineisPipi” ...
Plainobjects: {firstName:'Jane',lastName:'Doe'} Arrays: ['apple','banana','cherry'] Here are a few examplesof basic syntax: // Two slashes start single-linecommentsvarx;// declaring a variablex=3+y;// assigning a value to the variable `x`foo(x,y);// calling function `foo` wit...