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@putout/plugin-for-of
Advanced tools
Readme
The
for...of
statement creates a loop which invokes a custom iteration hook with statements to be executed for the value of each element of an array.(c) MDN
🐊Putout plugin adds support of transformation for...of
statements.
npm i @putout/plugin-for-of
{
"rules": {
"for-of/map": "on",
"for-of/for-in": "on",
"for-of/for-each": "on",
"for-of/reduce": "on",
"for-of/remove-unused-variables": "on",
"for-of/remove-useless": "on",
"for-of/remove-useless-array-from": "on",
"for-of/remove-useless-variables": ["on", {
"maxProperties": 4
}],
"for-of/for": "on"
}
}
The
map()
method creates a new array populated with the results of calling a provided function on every element in the calling array.(c) MDN
names.map((name) => {
alert(`hello ${name}`);
});
for (const name of names) {
alert(`hello ${name}`);
}
The
for...in
statement iterates over all enumerable properties of an object that are keyed by strings.(c) MDN
for (const item in object) {
if (object.hasOwnProperty(item))
log(item);
}
for (const item in object) {
if (!object.hasOwnProperty(item))
continue;
log(item);
}
for (const item of Object.keys(object)) {
log(item);
}
The
forEach()
method executes a provided function once for each array element.(c) MDN
Object
.keys(json)
.forEach((name) => {
manage(name, json[name]);
});
[].forEach.call(arguments, (item) => {
console.log(item);
});
for (const name of Object.keys(json)) {
manage(name, json[name]);
}
for (const item of arguments) {
console.log(item);
}
- The
reduce()
method executes a user-supplied reducer callback function on each element of the array, in order, passing in the return value from the calculation on the preceding element. The final result of running the reducer across all elements of the array is a single value.(c) MDN
You should always look at second argument of a reducer since it changes logic drastically and should read back and forth a couple times to understand what is going on.
Recursive functions like
.reduce()
can be powerful but sometimes difficult to understand, especially for less experienced JavaScript developers. If code becomes clearer when using other array methods, developers must weigh the readability tradeoff against the other benefits of using.reduce()
. In cases where.reduce()
is the best choice, documentation and semantic variable naming can help mitigate readability drawbacks.(c) MDN
Check it out in 🐊Putout Editor.
const result = list.reduce((a, b) => a + b, 1);
let sum = 1;
for (const a of list) {
sum += a;
}
for (const {a, b} of c) {
console.log(a);
}
for (const {a} of c) {
console.log(a);
}
The
Array
enables storing a collection of multiple items under a single variable name.(c) MDN
for (const a of ['hello']) {
console.log(a);
}
console.log('hello');
for (const a of b) {
const {c} = a;
}
for (const {c} of b) {}
The
Array.from()
static method creates a new, shallow-copiedArray
instance from an iterable or array-like object.(c) MDN
for (const x of Array.from(y)) {}
for (const x of y) {}
The
for
statement creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement to be executed in the loop.(c) MDN
const n = items.length;
for (let i = 0; i < n; i++) {
const item = items[i];
log(item);
}
for (const item of items) {
log(item);
}
for (let i = 0; i < array.length; i++) {
const item = array[i];
console.log(item);
}
for (const item of items) {
log(item);
}
for (let i = 0; i < array.length; i++) {
const item = array[i];
console.log(i, item);
}
for (const [i, item] of array.entries()) {
console.log(i, item);
}
const n = array.length;
for (let i = 0; i < n; i++) {
const item = array[i];
console.log(i, item);
}
for (const [i, item] of array.entries()) {
console.log(i, item);
}
MIT
FAQs
🐊Putout plugin adds ability to apply for...of
The npm package @putout/plugin-for-of receives a total of 3,303 weekly downloads. As such, @putout/plugin-for-of popularity was classified as popular.
We found that @putout/plugin-for-of demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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