• In-depth understanding of JavaScript – loops come here


    It really hurts to write this because my heart is not here anymore. It took a week of back and forth to pry the keyboard circular assembly order There are various loops in JavaScript, such as for, for(reverse), for…in, for…of, forEach, map, etc. What are the characteristics of each of these loops? for loop This […]

  • In-depth understanding of JavaScript – string


    Overview The String() constructor is used to create string objects and string primitive values properties and methods String objects have the following properties and methods (excluding inherited properties and methods) Attributes prototype method froCharCode() Instance Properties and Methods instance attribute constructor length instance method slice(): Extract a part of a string and return a new […]

  • js array operations – object arrays are grouped according to a same field


    Let’s talk nonsense Recently, in actual business, it is necessary to write a method to re-program objects with equal field values ​​into an array according to an identical field of each object in the array, and return a nested array object to make a special summary.Of course, it should be noted that during the development […]