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Abu Saleh Faysal
Abu Saleh Faysal

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HackerRank — Problem Solving — JavaScript — Plus Minus

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Given an array of integers, calculate the ratios of its elements that are positive, negative, and zero. Print the decimal value of each fraction on a new line with places after the decimal.


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Step 01: Take three variables named "positive", "negative" and "zero. Store initial value as zero(0).
Step 02: Iterate a for loop through the given array.
Step 03: While iterating the array we have to count the positive, negative and zero values.
Step 04: Calculate the ratios by dividing with the array length.
Step 05: Print the results.

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11 Tips That Make You a Better Typescript Programmer


1 Think in {Set}

Type is an everyday concept to programmers, but it’s surprisingly difficult to define it succinctly. I find it helpful to use Set as a conceptual model instead.

#2 Understand declared type and narrowed type

One extremely powerful typescript feature is automatic type narrowing based on control flow. This means a variable has two types associated with it at any specific point of code location: a declaration type and a narrowed type.

#3 Use discriminated union instead of optional fields


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