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21 Cards in this Set
- Front
- Back
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.unshift(parameter) |
Adds new array value to beginning of an array |
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.push(parameter) |
Adds value to array at the end |
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(parameters).to_a |
Turns a set of values into an array |
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array.uniq |
Show unique values in array |
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array.each |
Loop method |
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y.select {|working var| object.method} |
Select according to these parameters and display. This ties to using {} for functional displays |
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array.join |
Join all array objects together into one unit w/out space |
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array.join(“ “) |
Join elements of an array with space in between each element |
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p.join(“-“) |
Join elements of an array with dash in between each element |
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How to delete a key value pair on a hash |
myhash.delete(:d) |
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To iterate through a hash using .each method and print out value |
myhash.each { |somekey, somevalue| puts somevalue } |
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To iterate through a hash using .each method and print key, value in sentence format |
myhash.each do { |somekey, somevalue| puts “The key is #{somekey} and the value is #{somevalue}” } |
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.abs |
Finds the absolute value of an integer and removes negatives — so if you want it to be negative you have to add a - |
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Modulo: find the last number |
int % 10 |
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Return # last digits of n Same as n % 10 |
num % (10 ** n) |
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Return decimal remainder |
(Equation).modulo(1) |
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Length of array |
array.length |
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Sort array |
array.sort |
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Convert array to string and put in descending order |
int.to_s.split(“ “).sort.reverse |
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how to get fixed number from a decimal |
num.round(3) |
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Precedence when comparing strings? |
Alphabetical precedence |
