054af09032
This updates ESLint and our shared eslint-config-openlayers to use Prettier. Most formatting changes were automatically applied with this:
npm run lint -- --fix
A few manual changes were required:
* In `examples/offscreen-canvas.js`, the `//eslint-disable-line` comment needed to be moved to the appropriate line to disable the error about the `'worker-loader!./offscreen-canvas.worker.js'` import.
* In `examples/webpack/exapmle-builder.js`, spaces could not be added after a couple `function`s for some reason. While editing this, I reworked `ExampleBuilder` to be a class.
* In `src/ol/format/WMSGetFeatureInfo.js`, the `// @ts-ignore` comment needed to be moved down one line so it applied to the `parsersNS` argument.
61 lines
1.3 KiB
JavaScript
61 lines
1.3 KiB
JavaScript
/**
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* @module ol/functions
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*/
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import {equals as arrayEquals} from './array.js';
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/**
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* Always returns true.
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* @returns {boolean} true.
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*/
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export function TRUE() {
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return true;
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}
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/**
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* Always returns false.
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* @returns {boolean} false.
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*/
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export function FALSE() {
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return false;
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}
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/**
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* A reusable function, used e.g. as a default for callbacks.
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*
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* @return {void} Nothing.
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*/
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export function VOID() {}
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/**
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* Wrap a function in another function that remembers the last return. If the
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* returned function is called twice in a row with the same arguments and the same
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* this object, it will return the value from the first call in the second call.
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*
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* @param {function(...any): ReturnType} fn The function to memoize.
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* @return {function(...any): ReturnType} The memoized function.
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* @template ReturnType
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*/
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export function memoizeOne(fn) {
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let called = false;
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/** @type {ReturnType} */
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let lastResult;
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/** @type {Array<any>} */
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let lastArgs;
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let lastThis;
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return function () {
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const nextArgs = Array.prototype.slice.call(arguments);
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if (!called || this !== lastThis || !arrayEquals(nextArgs, lastArgs)) {
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called = true;
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lastThis = this;
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lastArgs = nextArgs;
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lastResult = fn.apply(this, arguments);
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}
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return lastResult;
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};
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}
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