-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathJS-Const-Variable-with-Array-&-Objects.html
More file actions
340 lines (271 loc) 路 9.89 KB
/
Copy pathJS-Const-Variable-with-Array-&-Objects.html
File metadata and controls
340 lines (271 loc) 路 9.89 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS Const Variable with Array & Objects</title>
<style>
* {
font-family: Arial, Helvetica, sans-serif;
}
table {
font-family: arial, sans-serif;
border-collapse: collapse;
width: 50%;
}
td,
th {
border: 1px solid #dddddd;
text-align: left;
padding: 8px;
}
tr:nth-child(even) {
background-color: #dddddd;
}
code[class*="language-"],
pre[class*="language-"] {
color: black;
background: none;
background-color: rgba(0, 0, 0, 0);
font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
font-size: 1em;
text-align: left;
white-space: pre;
word-spacing: normal;
word-break: normal;
word-wrap: normal;
line-height: 1.5;
-moz-tab-size: 4;
-o-tab-size: 4;
tab-size: 4;
-webkit-hyphens: none;
-moz-hyphens: none;
-ms-hyphens: none;
hyphens: none;
}
:not(pre) > code[class*="language-"]::after,
pre[class*="language-"]::after {
right: 0.75em;
left: auto;
-webkit-transform: rotate(2deg);
-moz-transform: rotate(2deg);
-ms-transform: rotate(2deg);
-o-transform: rotate(2deg);
transform: rotate(2deg);
}
pre[class*="language-"]::before,
pre[class*="language-"]::after {
content: "";
z-index: -2;
display: block;
position: absolute;
bottom: 0.75em;
left: 0.18em;
width: 40%;
height: 20%;
max-height: 13em;
-webkit-transform: rotate(-2deg);
-moz-transform: rotate(-2deg);
-ms-transform: rotate(-2deg);
-o-transform: rotate(-2deg);
transform: rotate(-2deg);
}
:not(pre) > code[class*="language-"],
pre[class*="language-"] {
background-color: #fdfdfd;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
margin-bottom: 1em;
}
pre[class*="language-"] {
position: relative;
margin: 0.5em 0;
margin-bottom: 0.5em;
overflow: visible;
padding: 0;
}
code[class*="language-"],
pre[class*="language-"] {
color: black;
background: none;
background-color: rgba(0, 0, 0, 0);
font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
font-size: 1em;
text-align: left;
white-space: pre;
word-spacing: normal;
word-break: normal;
word-wrap: normal;
line-height: 1.5;
-moz-tab-size: 4;
-o-tab-size: 4;
tab-size: 4;
-webkit-hyphens: none;
-moz-hyphens: none;
-ms-hyphens: none;
hyphens: none;
}
pre {
display: block;
font-size: 87.5%;
color: #212529;
}
pre {
margin-top: 0;
margin-bottom: 1rem;
overflow: auto;
-ms-overflow-style: scrollbar;
}
code,
kbd,
pre,
samp {
font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
"Courier New", monospace;
font-size: 1em;
}
pre[class*="language-"] > code {
position: relative;
border-left: 10px solid #358ccb;
box-shadow: -1px 0px 0px 0px #358ccb, 0px 0px 0px 1px #dfdfdf;
background-color: #fdfdfd;
background-image: linear-gradient(
transparent 50%,
rgba(69, 142, 209, 0.04) 50%
);
background-size: 3em 3em;
background-origin: content-box;
background-attachment: local;
}
code[class*="language"] {
max-height: inherit;
height: inherit;
padding: 0 1em;
display: block;
overflow: auto;
}
code[class*="language-"],
pre[class*="language-"] {
color: black;
background: none;
background-color: rgba(0, 0, 0, 0);
background-attachment: scroll;
background-image: none;
background-size: auto;
background-origin: padding-box;
font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
font-size: 1em;
text-align: left;
white-space: pre;
word-spacing: normal;
word-break: normal;
word-wrap: normal;
line-height: 1.5;
-moz-tab-size: 4;
-o-tab-size: 4;
tab-size: 4;
-webkit-hyphens: none;
-moz-hyphens: none;
-ms-hyphens: none;
hyphens: none;
}
pre code {
font-size: inherit;
color: inherit;
word-break: normal;
}
code {
font-size: 87.5%;
color: #e83e8c;
word-wrap: break-word;
}
code,
kbd,
pre,
samp {
font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
"Courier New", monospace;
font-size: 1em;
}
*,
::after,
::before {
box-sizing: border-box;
}
</style>
</head>
<body>
<h1>JS Const Variable with Array & Objects</h1>
<hr />
<h3>CONST ARRAYS</h3>
<p>
The code above has an array variable called numbers holding three values.
Even though the numbers array is a const you鈥檙e able to update or change
the variable. For example, you can add another number to the numbers array
by using the push method. Methods are actions you perform on the
array or object.<br />
<br />
const numbers = [1,2,3];<br />
numbers.push(4);<br />
console.log(numbers) // Outpusts [1,2,3,4];
</p>
<hr />
<h3>CONST OBJECTS</h3>
<p>
The modifying principle applies to an object for example.<br />
<br />
const user = {<br />
name: "Gary",<br />
}<br />
<br />
user.age = 29<br />
console.log(user) // {name: "Gary", age: 29<br />
</p>
<p>
The code above creates a user object with a name property then it assigns
a new age property to object. One thing to remember const does not stop
array and objects from being modified it only stops the variable itself
from being reassigned or being overwritten for example.<br />
<br />
const user = {<br />
name: "Gary",<br />
}<br />
<br />
person = { name: "Bob" } // Uncaught TypeError: Assignment to constant
variable.<br />
</p>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">name</span> <span class="token operator">:</span> <span class="token string">"Ram"</span><span class="token punctuation">,</span>
<span class="token literal-property property">age</span> <span class="token operator">:</span> <span class="token number">25</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
a<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">"Yahoo Baba"</span><span class="token punctuation">;</span>
a<span class="token punctuation">.</span>age <span class="token operator">=</span> <span class="token number">55</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">;</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span></code></pre>
<hr />
</body>
<script>
"use strict";
const ary = [50, 40, 30];
ary[1] = 10;
console.log(ary);
const obj = { name: "Hamza Khan Lodhi", age: 17 };
obj.age = 10;
console.log(obj);
</script>
</html>