Spread syntax vs Rest parameter in ES2015 / ES6

Question

Can someone explain to me the difference between spread syntax and rest parameters in ES2015?

Answer 1

In a spread, you are expanding a single variable into more

var ijk=[‘i’,’j’,’k’];

var xyz=[‘x’,’y’,’z’];

var a=[...ijk,..xyz];

console.log(a)

The output will be [“i”,”j”,”k”,”x”,”y”,”z”]

In a rest argument, you are collapsing all the arguments of a function into an array

function sum( first, ...others )

 {

 for ( var i = 0; i < others.length; i++ ) 

first += others[i]; 

return first; 

}

 console.log(sum(1,2,3,4))

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