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Javascript – how can we use spread operator for array in angular?

take the two variables a and b as a two different arrays the variable c shows the output in only one array that means this method merges the two or more arrays into a single array

let a=[a,b];
let b=[c,d];
c=[a,...b]

output = [[a,b],c,d]

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2

Answers


  1. 0

    If you want merge array a & b you should use spread like this:
    let c=[...a,...b]

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  2. 0

    You can spread both arrays in order to get merged one single dimentional array

    let a=["a","b"];
let b=["c","d"];
c=[...a,...b]

    output

    c = ["a", "b", "c","d"];

    Spread operator in javascript spreads contents of Array and Objects,
    So, writing

    const a = [1,2,3,4];
...a // means 1,2,3,4 (without wrapper array)

    you can use these spreaded elements,

    In a Function as arguments

    function sum(a,b,c,d){
 return a+b+c+d;
}
const nums = [1,2,3,4];
const result = sum(...nums); // becomes ->  sum(1,2,3,4);

    To Form Another Array

    const nums = [1,2,3,4];
const nums2 = [...nums, 5,6,7,8]; // -> [1,2,3,4,5,6,7,8];

    You can also create object

    const nums = [1,2,3,4];
const obj = {...nums};

/*
Output

{
  "1":1,
  "2":2,
  "3":3,
  "4":4
}

*/

    And Many more things

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