Common operations for Json arrays in Js

We first define a JSON array object as follows:

var persons = [    "Tina"    , age:14}, "Timo", Age:15},    "Lily", Age:16  },    "Lucy", Age:16}]

I. Get the corresponding object based on the object property value

// 1. Get name equals Lily's Object var lily = Persons.filter (P) = {    return p.name = = "Lily "// Print results [{name:" Lily ", age:16}]// Note: the filter () method returns an array of var twins = Persons.filter ((p) + =    {return p.age == +//  Print results [{name: "Lily", Age:16},{name: "Lucy", Age:16}]

Two. Delete one of the objects

//Remove the name equals Tina object, using the Splice () method//1. First we have to get this objectvarTina = Persons.filter ((p) = = {    returnP.name = = "Tina";});//2. Next get the object in the array corresponding to the indexvarindex = Persons.indexof (tina[0]);//3. If it is present, delete it, index > 1 represents the existenceIndex >-1 && persons.splice (index, 1); Console.log (persons);//print result [{name: "Timo", age:15}, {name: "Lily", age:16}, {name: "Lucy", Age:16}]

Three. Modify the property values of one of the objects

// Change the age of name equal to Timo // 1. Get Timo Object var timo = Persons.filter ((p) = =    {return p.name = = "Timo"  ;}); // 2. ModifyAge timo[0].age = 20;

Four. Add an object to the array

// The simplest of the Persons.push ({name: "similar", age:18});

--Note: All of the above operations will have a direct effect on the original array.

Common operations for Json arrays in Js