diff --git a/static/js/emoji_picker.js b/static/js/emoji_picker.js
index 14d5b8c6e7..d4d7b62202 100644
--- a/static/js/emoji_picker.js
+++ b/static/js/emoji_picker.js
@@ -215,9 +215,7 @@ function filter_emojis() {
 
             for (const emoji_dict of emojis) {
                 for (const alias of emoji_dict.aliases) {
-                    const match = _.every(search_terms, function (search_term) {
-                        return alias.includes(search_term);
-                    });
+                    const match = search_terms.every(search_term => alias.includes(search_term));
                     if (match) {
                         search_results.push(_.extend({}, emoji_dict, {name: alias}));
                         break;  // We only need the first matching alias per emoji.
diff --git a/static/js/filter.js b/static/js/filter.js
index b8270afdad..f37744b150 100644
--- a/static/js/filter.js
+++ b/static/js/filter.js
@@ -572,7 +572,7 @@ Filter.prototype = {
         // build JavaScript code in a string and then eval() it.
 
         return function (message) {
-            return _.all(operators, function (term) {
+            return operators.every(term => {
                 let ok = message_matches_search_term(message, term.operator, term.operand);
                 if (term.negated) {
                     ok = !ok;
diff --git a/static/js/people.js b/static/js/people.js
index 28707a01c2..81de175e0b 100644
--- a/static/js/people.js
+++ b/static/js/people.js
@@ -162,7 +162,7 @@ exports.user_ids_string_to_emails_string = function (user_ids_string) {
         return person && person.email;
     });
 
-    if (!_.all(emails)) {
+    if (!emails.every(Boolean)) {
         blueslip.warn('Unknown user ids: ' + user_ids_string);
         return;
     }
@@ -201,7 +201,7 @@ exports.reply_to_to_user_ids_string = function (emails_string) {
         return person && person.user_id;
     });
 
-    if (!_.all(user_ids)) {
+    if (!user_ids.every(Boolean)) {
         return;
     }
 
@@ -257,7 +257,7 @@ exports.email_list_to_user_ids_string = function (emails) {
         return person && person.user_id;
     });
 
-    if (!_.all(user_ids)) {
+    if (!user_ids.every(Boolean)) {
         blueslip.warn('Unknown emails: ' + emails);
         return;
     }
@@ -464,7 +464,7 @@ exports.update_email_in_reply_to = function (reply_to, user_id, new_email) {
 
     const persons = emails.map(email => people_dict.get(email.trim()));
 
-    if (!_.all(persons)) {
+    if (!persons.every(Boolean)) {
         return reply_to;
     }
 
@@ -494,7 +494,7 @@ exports.pm_with_operand_ids = function (operand) {
         persons = _.without(persons, people_by_user_id_dict.get(my_user_id));
     }
 
-    if (!_.all(persons)) {
+    if (!persons.every(Boolean)) {
         return;
     }
 
@@ -643,7 +643,7 @@ exports.is_valid_email_for_compose = function (email) {
 
 exports.is_valid_bulk_emails_for_compose = function (emails) {
     // Returns false if at least one of the emails is invalid.
-    return _.every(emails, function (email) {
+    return emails.every(email => {
         if (!exports.is_valid_email_for_compose(email)) {
             return false;
         }
@@ -804,9 +804,7 @@ exports.build_person_matcher = function (query) {
             return true;
         }
 
-        return _.all(termlet_matchers, function (matcher) {
-            return matcher(user);
-        });
+        return termlet_matchers.every(matcher => matcher(user));
     };
 };
 
diff --git a/static/js/stream_data.js b/static/js/stream_data.js
index 450829a6a1..8bd72bf291 100644
--- a/static/js/stream_data.js
+++ b/static/js/stream_data.js
@@ -166,9 +166,7 @@ exports.is_subscriber_subset = function (sub1, sub2) {
     if (sub1.subscribers && sub2.subscribers) {
         const sub2_set = sub2.subscribers;
 
-        return _.every(Array.from(sub1.subscribers.keys()), (key) => {
-            return sub2_set.has(key);
-        });
+        return Array.from(sub1.subscribers.keys()).every(key => sub2_set.has(key));
     }
 
     return false;
@@ -451,9 +449,7 @@ exports.update_calculated_fields = function (sub) {
 };
 
 exports.all_subscribed_streams_are_in_home_view = function () {
-    return _.every(exports.subscribed_subs(), function (sub) {
-        return !sub.is_muted;
-    });
+    return exports.subscribed_subs().every(sub => !sub.is_muted);
 };
 
 exports.home_view_stream_names = function () {
diff --git a/static/js/tictactoe_widget.js b/static/js/tictactoe_widget.js
index c3b3acce28..66c8f692f1 100644
--- a/static/js/tictactoe_widget.js
+++ b/static/js/tictactoe_widget.js
@@ -38,7 +38,7 @@ const tictactoe_data_holder = function () {
             return square_values[i];
         }
 
-        return lines.some(line_won) || _.all(board, filled);
+        return lines.some(line_won) || board.every(filled);
     }
 
     self.get_widget_data = function () {
diff --git a/static/js/vdom.js b/static/js/vdom.js
index 63a198969a..281bd2043c 100644
--- a/static/js/vdom.js
+++ b/static/js/vdom.js
@@ -13,9 +13,7 @@ exports.eq_array = (a, b, eq) => {
         return false;
     }
 
-    return _.all(a, (item, i) => {
-        return eq(item, b[i]);
-    });
+    return a.every((item, i) => eq(item, b[i]));
 };
 
 exports.ul = (opts) => {