Checks if the given argument is a symbol.
Use typeof to check if a value is classified as a symbol primitive.
代码片段
const isSymbol = val => typeof val === 'symbol';使用样例
isSymbol(Symbol('x')); // trueChecks if the given argument is a symbol.
Use typeof to check if a value is classified as a symbol primitive.
const isSymbol = val => typeof val === 'symbol';isSymbol(Symbol('x')); // true