Task 80% complete

task_2_ts/ts/util.ts

@@ -0,0 +1,48 @@
+import {
+    CSVRecord
+} from './types';
+
+export const numberCheckPredicate = ( value: string ) => {
+    return value === 'number';
+};
+
+export const stringOrNumberCheckPredicate = ( value: string ) => {
+    return value === 'string' || value === 'number';
+};
+
+
+export const computeMinMax = ( list: CSVRecord[], selectedColumn: string ): [number, number, number] => {
+    const containsList: number[] = [];
+
+    let min = Number.MAX_VALUE;
+    let max = Number.MIN_VALUE;
+
+    for ( let i = 0; i < list.length; i++ ) {
+        const el = list[i]!;
+        const curr = el[ selectedColumn ]! as number;
+
+        if ( curr < min ) min = curr;
+        else if ( curr > max ) max = curr;
+
+        if ( !containsList.includes( curr ) ) containsList.push( curr );
+    }
+
+    return [
+        min,
+        max,
+        containsList.length
+    ];
+};
+
+export const computeDifferent = ( list: CSVRecord[], selectedColumn: string ): number => {
+    const containsList: string[] = [];
+
+    for ( let i = 0; i < list.length; i++ ) {
+        const el = list[i]!;
+        const curr = el[ selectedColumn ]! as string;
+
+        if ( !containsList.includes( curr ) ) containsList.push( curr );
+    }
+
+    return containsList.length;
+};