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Spread Operator Back
In ES6, Spread Operator ... is used to spread an array into more than one arguments:
/** method call */
myFunction(...args)
/** array literal */
[...iteralObject, 4, 5, 6]
So far, in ES5, we will use Function.prototype.apply to spread an array into more than one arguments:
function myFunction(x, y, z) {}
var args = [0, 1, 2];
myFunction.apply(null, args);
But in ES6, you can code like this:
function myFunction(v, w, x, y, z) {}
var args = [0, 1];
myFunction(-a, ...args, 2, ...[3]);
Powerful Array Literal
With Spread Operator, we can code less to add attributes to an array:
var parts = ['shoulder', 'knee'];
var body = ['head', ...parts, 'legs']; /** => ['head', 'shoulder', 'knee', legs'] */
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