How to use 'javascript history list' in JavaScript

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function do_history(args)
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{
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    var h = ""
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    for (var i in history_list) {
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        h += "<div>" + i + "  " + history_list[i] + "</div>";
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    }
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    return h;
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}

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addHistory(): void {
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  this.history.unshift({
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    og: null,
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    fg: null,
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    gallons: null,
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    ingredients: '',
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    notes: '',
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    recipe_name: '',
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    recipe_id: null,
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    brew_date: new Date(),
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    id: null
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  });
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  this.isCollapsed.unshift(true);
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  this.isEdit.unshift(true);
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}