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/node_modules/
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# default-value
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TODO
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## License
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[WTFPL](http://www.wtfpl.net/txt/copying/) or [CC0](https://creativecommons.org/publicdomain/zero/1.0/), whichever you prefer. A donation and/or attribution are appreciated, but not required.
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## Donate
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My income consists largely of donations for my projects. If this module is useful to you, consider [making a donation](http://cryto.net/~joepie91/donate.html)!
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You can donate using Bitcoin, PayPal, Flattr, cash-in-mail, SEPA transfers, and pretty much anything else.
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## Contributing
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Pull requests welcome. Please make sure your modifications are in line with the overall code style, and ensure that you're editing the files in `src/`, not those in `lib/`.
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Build tool of choice is `gulp`; simply run `gulp` while developing, and it will watch for changes.
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Be aware that by making a pull request, you agree to release your modifications under the licenses stated above.
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## Usage
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TODO
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## API
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TODO
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var gulp = require("gulp");
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var presetES2015 = require("@joepie91/gulp-preset-es2015");
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var source = ["src/**/*.js"]
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gulp.task('babel', function() {
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return gulp.src(source)
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.pipe(presetES2015({
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basePath: __dirname
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}))
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.pipe(gulp.dest("lib/"));
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});
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gulp.task("watch", function () {
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gulp.watch(source, ["babel"]);
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});
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gulp.task("default", ["babel", "watch"]);
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'use strict';
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module.exports = require("./lib");
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{
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"name": "default-value",
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"version": "0.0.1",
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"description": "Lets you easily define a default value for undefined options, with optional support for Promises",
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"main": "index.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"repository": {
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"type": "git",
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"url": "http://git.cryto.net/joepie91/node-default-value.git"
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},
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"keywords": [
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"default"
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],
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"author": "Sven Slootweg",
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"license": "WTFPL",
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"dependencies": {
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"es6-promise-try": "0.0.1"
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},
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"devDependencies": {
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"@joepie91/gulp-preset-es2015": "^1.0.1",
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"babel-preset-es2015": "^6.6.0",
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"gulp": "^3.9.1"
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}
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}
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'use strict';
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const promiseTry = require("es6-promise-try");
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function evaluateValue(value) {
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if (typeof value === "function") {
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return value();
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} else {
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return value;
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}
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}
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function defaultValue(value, fallbackValue) {
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value = evaluateValue(value);
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if (value != null) {
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return value;
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} else {
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return evaluateValue(fallbackValue);
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}
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}
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defaultValue.async = function defaultAsyncValue(value, fallbackValue) {
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return promiseTry(() => {
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return evaluateValue(value);
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}).then((resultValue) => {
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if (resultValue != null) {
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return resultValue;
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} else {
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return evaluateValue(fallbackValue);
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}
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})
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}
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module.exports = defaultValue;
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'use strict';
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const promiseTry = require("es6-promise-try");
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const defaultValue = require("./");
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function promiseThatReturns(value) {
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return Promise.resolve(value);
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}
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console.log(defaultValue(null, () => 4));
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console.log(defaultValue("foo", "bar"));
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promiseTry(() => {
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return Promise.all([
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defaultValue.async(promiseThatReturns(undefined), promiseThatReturns(Infinity)),
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defaultValue.async(() => promiseThatReturns("baz"), promiseThatReturns("qux"))
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]);
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}).then((results) => {
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console.log(results[0]);
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console.log(results[1]);
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})
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