js splice vs slice

js splice vs slice

splice

insert, replcae, add, delete

// let arrDeletedItems = array.splice(start[, deleteCount[, item1[, item2[, ...]]]])
const months = ['1', '2', '3'];

// insert, delete 0
months.splice(1, 0, '5');// ["1", "5", "2", "3"]
console.log(months);

// replace, delete 1
months.splice(3, 1, '6');// ["1", "5", "2", "6"]
console.log(months);

// add, delete -1
months.splice(4, 1, '7');// ["1", "5", "2", "6", "7"]
console.log(months);

// delete, delete 1
months.splice(4, 1);// ["1", "5", "2", "6"]
console.log(months);

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

demo

https://stackoverflow.com/questions/37601282/javascript-array-splice-vs-slice

https://www.w3schools.com/jsref/jsref_slice_string.asp

let dataGET = [
    {
        index: 0,
        keyword: "a",
        value: "1",
        description: "a=1",
        operate: ["edit", "save", "cancel"],
        isEdit: false,
    },
    {
        index: 1,
        keyword: "b",
        value: "2",
        description: "b=1",
        operate: ["edit", "save", "cancel"],
        isEdit: false,
    },
    {
        index: 2,
        keyword: "c",
        value: "3",
        description: "c=1",
        operate: ["edit", "save", "cancel"],
        isEdit: false,
    },
];

// let arr = dataGET.slice(1, 1);

// console.log(arr);

//splice
var array=[1,2,3,4,5];
console.log(array.splice(2, 1));

//slice
var array2=[1,2,3,4,5]
console.log(array2.slice(2, 1));


console.log("----after-----");
console.log(array);
console.log(array2);

splice & delete Array item by index

index = 2

//splice & will modify the origin array
const arr1 = [1,2,3,4,5];
//slice & won't modify the origin array
const arr2 = [1,2,3,4,5]

console.log("----before-----");
console.log(arr1.splice(2, 1));
console.log(arr2.slice(2, 1));

console.log("----after-----");
console.log(arr1);
console.log(arr2);

refs

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