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Commit 437caad

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committed
added coding shortcut, output, function questions and memory garbage collection
1 parent 068740f commit 437caad

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4 files changed

+151
-19
lines changed

4 files changed

+151
-19
lines changed

‎Interview-Questions/func.js

Lines changed: 25 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1,30 +1,29 @@
11
// what is output?
22
const foo = () => {
3-
let a = b = 10;
3+
let a = (b = 10);
44
a++;
5-
return a
6-
}
5+
return a;
6+
};
77

88
foo();
99

1010
console.log(a);
1111
console.log(b);
1212

13-
1413
// output
1514
function createIncrement() {
16-
let count = 0;
15+
let count = 0;
1716

18-
function increment() {
19-
count++;
20-
}
17+
function increment() {
18+
count++;
19+
}
2120

22-
let message = `Count is ${count}`;
23-
function log() {
24-
console.log(message);
25-
}
21+
let message = `Count is ${count}`;
22+
function log() {
23+
console.log(message);
24+
}
2625

27-
return [increment, log];
26+
return [increment, log];
2827
}
2928

3029
const [increment, log] = createIncrement();
@@ -36,22 +35,29 @@ increment();
3635
log();
3736

3837
// Console sequence output?
39-
function run() {
38+
function run() {
4039
const promise = new Promise((resolve) => {
41-
resolve('promise');
42-
})
40+
resolve("promise");
41+
});
4342

4443
setTimeout(() => {
45-
console.log('setTimeout');
44+
console.log("setTimeout");
4645
});
4746

48-
promise.then(res => console.log(res))
47+
promise.then((res) => console.log(res));
4948

50-
console.log('log');
49+
console.log("log");
5150
}
5251

5352
run();
5453

5554
// How does the Javascript interprets the following code?
5655
console.log(x);
5756
var x = 100;
57+
58+
// Output
59+
(function () {
60+
var a = (b = 5);
61+
})();
62+
63+
console.log(b);

‎Interview-Questions/output.js

Lines changed: 84 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -62,3 +62,87 @@ const array = [NaN];
6262

6363
const result = array.includes(NaN);
6464
console.log(result); // True: why? => array.includes follows sameValueZero algorithm
65+
66+
// Output
67+
const p = Promise.resolve("Hello");
68+
p.then((val) => {
69+
console.log(val);
70+
return `${val} world`;
71+
}).then((newVal) => {
72+
console.log("new ", newVal);
73+
});
74+
75+
// Output => level => easy
76+
function* counter() {
77+
let index = 0;
78+
while (true) {
79+
yield index++;
80+
}
81+
}
82+
83+
const gen = counter();
84+
85+
console.log(gen.next().value);
86+
console.log(gen.next().value);
87+
console.log(gen.next().value);
88+
89+
// Output
90+
var y = 1;
91+
if (function f() {}) {
92+
y += typeof f;
93+
}
94+
95+
console.log(y);
96+
97+
// Output
98+
var k = 1;
99+
if (1) {
100+
eval(function foo() {});
101+
k += typeof foo;
102+
}
103+
104+
console.log(k);
105+
106+
// Output
107+
var k = 1;
108+
if (1) {
109+
function foo() {}
110+
k += typeof foo;
111+
}
112+
console.log(k);
113+
114+
// Write a function that would allow you to do this 👉🏻 multiply(5)(6)
115+
116+
// Ans:
117+
function multiply(a) {
118+
return function (b) {
119+
return a * b;
120+
};
121+
}
122+
123+
multiply(5)(6);
124+
125+
// Explain what is callback function is and provide a simple example
126+
127+
function modifyArray(arr, callback) {
128+
arr.push(100);
129+
130+
callback();
131+
}
132+
133+
let arr = [1, 2, 3, 4, 5];
134+
135+
modifyArray(arr, () => {
136+
console.log("Array has been modified ", arr);
137+
});
138+
139+
// Given a string, reverse each word in the sentence
140+
const reverseBySeparator = (str, separator) =>
141+
str.split(separator).reverse().join(separator);
142+
143+
const str = "Welcome to this Javascript Guide!";
144+
const reverseEntireSentence = reverseBySeparator(str, "");
145+
146+
const reverseEachWord = reverseBySeparator(reverseEntireSentence, " ");
147+
148+
console.log(reverseEntireSentence, reverseEachWord);

‎Memory/garbageCollection.js

Lines changed: 21 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,21 @@
1+
/**
2+
* Garbage collection algorithms
3+
* - Reference counting algorithm
4+
* - Mark and sweep algorithm
5+
*/
6+
7+
let obj = { a: 10 };
8+
obj = null;
9+
10+
function test() {
11+
let testObj = {};
12+
let testObj2 = {};
13+
14+
// Circular dependency
15+
testObj.key = testObj2;
16+
testObj2.key = testObj;
17+
18+
return "blah";
19+
}
20+
21+
test();

‎js-coding-technique/asyncAwait.js

Lines changed: 21 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,21 @@
1+
// Best Practice
2+
async function getAddress() {
3+
const streetAddress = await getStreetAddress();
4+
const city = await getCity();
5+
const state = await getState();
6+
const zip = await getZip();
7+
8+
return `${streetAddress}, ${city}, ${state}, ${zip}`;
9+
}
10+
11+
// Instated
12+
async function getAddress() {
13+
let [streetAddress, city, state, zip] = await Promise.all([
14+
getStreetAddress(),
15+
getCity(),
16+
getState(),
17+
getZip(),
18+
]);
19+
20+
return `${streetAddress}, ${city}, ${state}, ${zip}`;
21+
}

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