Extended Parameter Handling with Spread Operator

Extended Parameter Handling with Spread Operator

Spreading of elements of an iterable collection (like an array or even a string) into both literal elements and individual function parameters.

Spreading of elements of an iterable collection (like an array or even a string) into both literal elements and individual function parameters.

var params = [ "hello", true, 7 ]
var other = [ 1, 2, ...params ] // [ 1, 2, "hello", true, 7 ]

function f (x, y, ...a) { return (x + y) * a.length } f(1, 2, ...params) === 9

var str = "foo" var chars = [ ...str ] // [ "f", "o", "o" ]

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