<h3>Go — Range (Basics</h3>
Go has an almost Python like function: Range. Range is used to iterate over elements in a lot of different Go data structures.
Of course we can range over slices and arrays, like:
<figure><img alt="" src="https://cdn-images-1.medium.com/max/874/1*8Y0po3tfti9sPdErmOr0cA.png"></figure>We get both the value and index when using the range function, though in the above example we didn’t use it.
<figure><img alt="" src="https://cdn-images-1.medium.com/max/840/1*7OVVe-T_DiAjUiBZm8tzjg.png"></figure>But we can also use range to go over the items in a map, getting both the key and value of each item in the map:
<figure><img alt="" src="https://cdn-images-1.medium.com/max/1024/1*-1k9awwOCQ6Eg2znPJZ-Lw.png"></figure>Another use of range is to range over the Unicode points of a string in go:
<figure><img alt="" src="https://cdn-images-1.medium.com/max/890/1*JBrUZZ52doWcBk0-jl9K0A.png"></figure><img src="https://medium.com/_/stat?event=post.clientViewed&amp;referrerSource=full_rss&amp;postId=794d386efdc0" width="1" height="1" alt="">

Go — Range (Basics

<h3>GO — Maps (basics)</h3>
GO’s version of other languages’: Hash, Dict, are called Maps.
To create a Map you can use the “make” function, here we create a map with type string for the keys, and type int for the values of the map:
<figure><img alt="" src="https://cdn-images-1.medium.com/max/722/1*Tg9qnK1k-ItHaWtyImgFOA.png"></figure>To access a value on the map you can use the square bracket anotation, showed above (m[“k1”] = 7). You can also initiate a Map and instantiate values on the new map on the same line:
<figure><img alt="" src="https://cdn-images-1.medium.com/max/976/1*sM0jmHakkyf2m6agri4AnA.png"></figure>You can use the builtin function:len returns the number of key/value pairs when called on a map:
<figure><img alt="" src="https://cdn-images-1.medium.com/max/840/1*gEap-pL3SvgFbHah9_qVQA.png"></figure>You can also delete members of the Map, by using the “delete” function, here deleting the key/value pair with the key “k2” on the map variable “m”:
<figure><img alt="" src="https://cdn-images-1.medium.com/max/554/1*ub1sTI6u3RWSLwpDySxdVQ.png"></figure>When accessing a value on a map, it returns two values. The second value indicates whether or not the key was present in the map. This is useful when to disambiguate between keys that are missing or keys that has “falsy” values like: 0 or “”, which could evaluate to false on usermade logic checks. Optionally you can also just put in a blank identifier: “_”, to omit the value.
<figure><img alt="" src="https://cdn-images-1.medium.com/max/1008/1*X9qpG9fG_sKceYa3aTZhrw.png"></figure><img src="https://medium.com/_/stat?event=post.clientViewed&amp;referrerSource=full_rss&amp;postId=70c757245d3f" width="1" height="1" alt="">

👋 Hello, my name is Nikolaj.

I am a Software Engineer based in Aarhus, Denmark. Currently I'm working at Friggtech as a fullstack engineer.

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