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repl: improve .help #8519

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silverwind wants to merge 3 commits into from
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repl: improve .help #8519

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82afbbb
repl: improve .help message
silverwind Sep 13, 2016
db73c0d
dynamically calculate amount of spaces based on command names
silverwind Sep 13, 2016
bc045e6
seed Array#reduce with 0
silverwind Sep 13, 2016
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dynamically calculate amount of spaces based on command names
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@silverwind
silverwind committed Sep 13, 2016
commit db73c0dcf1709fec543a75203ea210840a7c1357
8 changes: 6 additions & 2 deletions lib/repl.js
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Expand Up @@ -1259,9 +1259,13 @@ function defineDefaultCommands(repl) {
repl.defineCommand('help', {
help: 'Print this help message',
action: function() {
Object.keys(this.commands).sort().forEach((name) => {
const names = Object.keys(this.commands).sort();
const longestNameLength = names.reduce((max, name) => {
return Math.max(max, name.length);

@princejwesley princejwesley Sep 13, 2016

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@silverwind (max, name) => Math.max(max, name.length) ? is it against style guide?

@silverwind silverwind Sep 13, 2016

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It's not, but it won't fit on 80 chars so I went with the longer form.

@princejwesley princejwesley Sep 13, 2016

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Why not named function? Feel free to ignore it

const maxFun = (max, name) => Math.max(max, name.length);
const longestNameLength = names.reduce(maxFun, 0);

or

const nameLengthList = names.map((n) => n.length);
const longestNameLength = nameLengthList.reduce(Math.max, 0);

@silverwind silverwind Sep 13, 2016

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TBH, I find that these reduce readability as compared to what I have now.

}, 1);
names.forEach((name) => {
const cmd = this.commands[name];
const spaces = ' '.repeat(Math.max(9 - name.length, 1));
const spaces = ' '.repeat(longestNameLength - name.length + 3);
const line = '.' + name + (cmd.help ? spaces + cmd.help : '') + '\n';
this.outputStream.write(line);
});
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