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Alexander 2017-10-26 04:31:04 +03:00 • committed by GitHub
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1-js/06-advanced-functions/02-rest-parameters-spread-operator/article.md
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# Rest parameters and spread operator # Rest parameters and spread operator
Many JavaScript built-in functions support on arbitrary number of arguments. Many JavaScript built-in functions support an arbitrary number of arguments.
For instance: For instance:
@ -35,7 +35,7 @@ For instance, to gather all arguments into array `args`:
function sumAll(...args) { // args is the name for the array function sumAll(...args) { // args is the name for the array
let sum = 0; let sum = 0;
for(let arg of args) sum += arg; for (let arg of args) sum += arg;
return sum; return sum;
} }
@ -207,7 +207,7 @@ alert( [...str] ); // H,e,l,l,o
The spread operator internally uses iterators to gather elements, the same way as `for..of` does. The spread operator internally uses iterators to gather elements, the same way as `for..of` does.
So, for a string, `for..of` returns characters and `...str` becomes `"h","e","l","l","o"`. The list of characters is passed to array initializer `[...str]`. So, for a string, `for..of` returns characters and `...str` becomes `"H","e","l","l","o"`. The list of characters is passed to array initializer `[...str]`.
For this particular task we could also use `Array.from`, because it converts an iterable (like a string) into an array: For this particular task we could also use `Array.from`, because it converts an iterable (like a string) into an array: