What are the methods to delete arrays in JavaScript?

JavaScript array deletion method: 1. Delete by index, the code is [someArray.shift()]; 2. Delete by condition, the code is [johnRemoved = someArray.filter(function(el)].

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, DELL G3 computer.

How to delete JavaScript arrays:

Delete by index

//1
someArray.shift(); // 删除第一个元素
//2
someArray = someArray.slice(1); // 删除第一个元素
//3
someArray.splice(0,1); // 删除第一个元素
//4
someArray.pop(); // 删除最后一个元素

Delete by condition

someArray = [{name:"Kristian", lines:"2,5,10"},
             {name:"John", lines:"1,19,26,96"},
             {name:"Brian",lines:"3,9,62,36" }];
johnRemoved = someArray.filter(function(el) {
    return el.name !== "John";
});
console.log(JSON.stringify(johnRemoved, null, ' '));

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