lodashSandbox: dropRightWhile

ES6 Enabled

by David McClelland

HTML

<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>
<div class="wrapper">
  <div class="title">
    <h3>
      _.dropRightWhile
    </h3>
  </div>
  <div class="subtitle">
    <h4>
      Remove elements from end of array while an evaluation is true of each element to be removed
    </h4>
  </div>
  <div class="workspace">
    <input id='startInput' type='text' value='[
  { "user": "barney",  "active": true },
  { "user": "fred",    "active": false },
  { "user": "pebbles", "active": false }
]' />
    <label for="startInput">array</label>
    <div class="actionArea">
      <button id="button1">dropWhile</button>
      <br />
      <button id="button2">dropWhile shorthand</button>
      <br />
      <button id="button3">dropRightWhile</button>
      <br />
      <button id="button4">dropRightWhile shorthand</button>
      <br />
    </div>
    <br />
    <textarea id="output" rows="2" value="output"></textarea>
  </div>
</div>

CSS

label {
  font-size: 12px;
}

.wrapper {
  display: flex;
  flex-direction: column;
  width: 500px;
}

.title,
.subtitle,
label {
  font-family: Helvetica;
  color: gray;
}

.workspace {
  display: flex;
  flex-direction: column;
}

.actionArea {
  border: 1px solid #EEEEEE;
  padding: 12px;
}

.actionArea button {
  width: 200px;
}

#output {
  font-family: Courier;
  font-size: 14px;
}

#input1,
#input2 {
  font-family: Courier;
  font-size: 14px;
}

#modValInput {
  font-family: Courier;
  font-size: 14px;
}

Babel + JSX

// find elements
let banner = document.getElementById("#playground");
let button = document.getElementById("button");
let startInput = document.getElementById('startInput');
let output = document.getElementById("output");

button1.onclick = () => {
  doOperation1();
}

button2.onclick = () => {
  doOperation2();
}

button3.onclick = () => {
  doOperation3();
}

button4.onclick = () => {
  doOperation4();
}

function doOperation1() {
	let inputVal = JSON.parse(startInput.value);
  output.value = JSON.stringify(_.dropWhile(inputVal, (o) => {
  return !o.active;
  }));
}

function doOperation2() {
	let inputVal = JSON.parse(startInput.value);
  output.value = JSON.stringify( _.dropWhile(inputVal, { 'user': 'pebbles', 'active': false }));
}

function doOperation3() {
	let inputVal = JSON.parse(startInput.value);
  output.value = JSON.stringify(_.dropRightWhile(inputVal, (o) => {
  return !o.active;
  }));
}

function doOperation4() {
	let inputVal = JSON.parse(startInput.value);
  output.value = JSON.stringify( _.dropRightWhile(inputVal, { 'user': 'barney', 'active': false }));
}