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Update working_with_lists.md (removing unnecessary use of echo) #540

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Jul 23, 2022
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Update working_with_lists.md (removing unnecessary use of echo) #540

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28 changes: 14 additions & 14 deletions book/working_with_lists.md
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@ For example:
let colors = [yellow green]
let colors = ($colors | prepend red)
let colors = ($colors | append purple)
echo $colors # [red yellow green purple]
$colors # [red yellow green purple]
```

## Iterating over lists
Expand All @@ -51,7 +51,7 @@ The following example gets all the colors whose names end in "e".

```bash
let colors = [red orange yellow green blue purple]
echo $colors | where ($it | str ends-with 'e')
$colors | where ($it | str ends-with 'e')
```

In this example, we keep only values higher than `7`.
Expand All @@ -61,7 +61,7 @@ In this example, we keep only values higher than `7`.
# This outputs the list [orange blue purple].

let scores = [7 10 8 6 7]
echo $scores | where $it > 7 # [10 8]
$scores | where $it > 7 # [10 8]
```

The [`reduce`](commands/reduce.md) command computes a single value from a list.
Expand All @@ -78,7 +78,7 @@ echo "total =" ($scores | math sum) # easier approach, same result

echo "product =" ($scores | reduce --fold 1 { |it, acc| $acc * $it }) # 96

echo $scores | reduce -n { |it, acc| $acc.item + $it.index * $it.item } # 3 + 1*8 + 2*4 = 19
$scores | reduce -n { |it, acc| $acc.item + $it.index * $it.item } # 3 + 1*8 + 2*4 = 19
```

## Accessing the list
Expand Down Expand Up @@ -129,16 +129,16 @@ For example:

```bash
# Do any color names end with "e"?
echo $colors | any? ($it | str ends-with "e") # true
$colors | any? ($it | str ends-with "e") # true

# Is the length of any color name less than 3?
echo $colors | any? ($it | str length) < 3 # false
$colors | any? ($it | str length) < 3 # false

# Are any scores greater than 7?
echo $scores | any? $it > 7 # true
$scores | any? $it > 7 # true

# Are any scores odd?
echo $scores | any? $it mod 2 == 1 # true
$scores | any? $it mod 2 == 1 # true
```

The [`all?`](commands/all.md) command determines if every item in a list
Expand All @@ -147,16 +147,16 @@ For example:

```bash
# Do all color names end with "e"?
echo $colors | all? ($it | str ends-with "e") # false
$colors | all? ($it | str ends-with "e") # false

# Is the length of all color names greater than or equal to 3?
echo $colors | all? ($it | str length) >= 3 # true
$colors | all? ($it | str length) >= 3 # true

# Are all scores greater than 7?
echo $scores | all? $it > 7 # false
$scores | all? $it > 7 # false

# Are all scores even?
echo $scores | all? $it mod 2 == 0 # false
$scores | all? $it mod 2 == 0 # false
```

## Converting the list
Expand All @@ -167,9 +167,9 @@ This can be called multiple times to flatten lists nested at any depth.
For example:

```bash
echo [1 [2 3] 4 [5 6]] | flatten # [1 2 3 4 5 6]
[1 [2 3] 4 [5 6]] | flatten # [1 2 3 4 5 6]

echo [[1 2] [3 [4 5 [6 7 8]]]] | flatten | flatten | flatten # [1 2 3 4 5 6 7 8]
[[1 2] [3 [4 5 [6 7 8]]]] | flatten | flatten | flatten # [1 2 3 4 5 6 7 8]
```

The [`wrap`](commands/wrap.md) command converts a list to a table. Each list value will
Expand Down