body: Statement; } interface BreakStatement <: Statement { type: "BreakStatement"; label: Identifier | null; } interface IfStatement <: Statement { type: "IfStatement"; test: Expression; consequent: Statement; alternate: Statement | null; } interface SwitchStatement <: Statement { type: "Swit...
8. When do we need to use the ‘return’ statement with the arrow function? Whenever there is more than one statement inside the arrow function then we need to use a return statement inside it, otherwise it is okay if we do not use it. Example – let add = (num1, num2) => {...
eslint: nonblock-statement-body-position // bad if (test) return false; // good if (test) return false; // good if (test) { return false; } // bad function foo() { return false; } // good function bar() { return false; } 如果通过 if 和 else 使用多行代码块,把 else 放在 i...
ECMAScript 6 之前的 JavaScript 没有 语句块 作用域;相反,语句块中声明的变量将成为语句块所在函数(或全局作用域)的局部变量。例如,如下的代码将在控制台输出 5,因为 x 的作用域是声明了 x 的那个函数(或全局范围),而不是 if 语句块。 如果使用 ECMAScript 6 中的 let 声明,上述行为将发生变化。 「变量...
16.1 用大括号 {} 包裹多行代码块。 eslint: nonblock-statement-body-position // bad if (test) return false; // good if (test) return false; // good if (test) { return false; } // bad function foo() { return false; } // good function bar() { return false; } ...
ternary operator, also known as the conditional operator, is used as shorthand for anif...elsestatement. A ternary operator is written with the syntax of a question mark (?) followed by a colon (:), as demonstrated below. (condition)?expression ontrue:expression onfalse ...
if_return (default: true) -- optimizations for if/return and if/continue inline (default: true) -- inline calls to function with simple/return statement: false -- same as 0 0 -- disabled inlining 1 -- inline simple functions 2 -- inline functions with arguments 3 -- inline functions...
eslint:object-shorthand // bad const value = 1; const atom = { value: value, addValue: function (newValue) { return atom.value + newValue; }, }; // good const value = 1; const atom = { value, addValue(newValue) { return atom.value + newValue; ...
A function declaration is not a statement.]Read ECMA-262's note on this issue. // bad if (currentUser) { function test() { console.log('Nope.'); } } // good let test; if (currentUser) { test = () => { console.log('Yup.'); }; }...
Switching Boolean values is one of the very basic programming problems and can be solved in many different ways.Instead of using the if statement to determine which value to set the Boolean value to, you can use the function to use! Flip the current value. non-operator. ...