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March 31, 2023

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Month: August 2020

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TypeScript tutorial: Lesson 25 – WeakMap

phptuts August 31, 2020
Starting with ECMAScript 2015, The WeakMap object is a collection of key/value pairs in which the keys are weakly referenced. The keys must be objects…
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TypeScript tutorial: Lesson 24 – Map

phptuts August 31, 2020
Starting with ECMAScript 2015, The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive…
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TypeScript tutorial: Lesson 23 – Symbols

phptuts August 31, 2020
Starting with ECMAScript 2015, symbol is a primitive data type, just like number and string. symbol values are created by calling the Symbol constructor or…
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TypeScript tutorial: Lesson 22 – Generics

phptuts August 31, 2020
Simple example about Generics Instead, we need a way of capturing the type of the argument in such a way that we can also use…
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TypeScript tutorial: Lesson 21 – Enum

phptuts August 31, 2020
TypeScript provides both numeric and string-based enums. Numeric enums Using an enum is simple: just access any member as a property off of the enum…
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TypeScript tutorial: Lesson 20 – Intersection Types

phptuts August 31, 2020
Intersection types are closely related to union types, but they are used very differently. An intersection type combines multiple types into one. This allows you…
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TypeScript tutorial: Lesson 19 – Literal Types

phptuts August 30, 2020
There are three sets of literal types available in TypeScript today: strings, numbers, and booleans; by using literal types you can allow an exact value…
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centos 7 cpu stuck

CentOS 7: BUG: soft lockup – CPU#3 stuck for 22s!

phptuts August 30, 2020
CentOS 7: BUG: soft lockup – CPU#3 stuck for 22s! Read current value of file /proc/sys/kernel/watchdog_thresh Increase this value:
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SSH Port Forwarding Example use OpenSSH client

phptuts August 28, 2020
To use the feature SSH Port Forwarding you must enable AllowTcpForwarding on your sshd_config Remote Forwarding To enable Remote Forwarding outside the server machine, you…
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Port forwarding is disabled to avoid man-in-the-middle attacks

How to fix: Port forwarding is disabled to avoid man-in-the-middle attacks.

phptuts August 28, 2020
Example command: ssh -v -R 12345:127.0.0.1:80 foo@localhost Solution: edit file /home/Administrator/.ssh/known_hosts delete old server key. Done!
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